bluesy (adj.) Look up bluesy at Dictionary.com
1946, from blues + -y (2).
bluff (v.) Look up bluff at Dictionary.com
1839, American English, poker term, perhaps from Dutch bluffen "to brag, boast," or verbluffen "to baffle, mislead." An identical word meant "blindfold, hoodwink" in 1670s, but the sense evolution and connection are unclear; OED calls it "one of the numerous cant terms ... which arose between the Restoration and the reign of Queen Anne." Extended or figurative sense by 1854. Related: Bluffed; bluffing.
bluff (n.1) Look up bluff at Dictionary.com
"broad, vertical cliff," 1680s, from bluff (adj.) "with a broad, flat front" (1620s), a sailors' word, probably from Dutch blaf "flat, broad." Apparently a North Sea nautical term for ships with flat vertical bows, later extended to landscape features.
bluff (n.2) Look up bluff at Dictionary.com
1844 as an alternative name for poker; from bluff (v.). As "an act of bluffing" by 1864.
bluffing (n.) Look up bluffing at Dictionary.com
1845, in the poker sense, verbal noun from bluff (v.).
bluffs (n.) Look up bluffs at Dictionary.com
see bluff (n.1).
bluish (adj.) Look up bluish at Dictionary.com
late 14c., blewysh; see blue + -ish.
blunder (v.) Look up blunder at Dictionary.com
mid-14c., "to stumble about blindly," from a Scandinavian source akin to Old Norse blundra "shut one's eyes," from PIE root *bhlendh- (see blind). Meaning "make a stupid mistake" is first recorded 1711. Related: Blundered; blundering.
blunder (n.) Look up blunder at Dictionary.com
mid-14c., apparently from blunder (v.), though of about the same age.
blunderbuss (n.) Look up blunderbuss at Dictionary.com
1650s, from Dutch donderbus, from donder "thunder" (Middle Dutch doner, donder, from Proto-Germanic *thunaraz; see thunder (n.)) + bus "gun" (originally "box, tube"); altered by resemblance to blunder.
blunderful (adj.) Look up blunderful at Dictionary.com
1881, jocular blend of blunder and wonderful.
blundering Look up blundering at Dictionary.com
mid-14c. as a present participle adjective; mid-15c. as a verbal noun, from blunder (v.). Related: Blunderingly.
blunt (adj.) Look up blunt at Dictionary.com
c.1200, "dull, obtuse," perhaps from or related to Old Norse blundra (see blunder (v.)). Of tools or weapons, late 14c. Meaning "abrupt of speech or manner" is from 1580s.
blunt (v.) Look up blunt at Dictionary.com
late 14c., from blunt (adj.). Related: Blunted; blunting.
blunt (n.) Look up blunt at Dictionary.com
street slang for "marijuana and tobacco cigar" (easier to pass around, easier to disguise, and the stimulant in the tobacco enhances the high from the pot) surfaced c.1993, but is said to have originated among Jamaicans in New York City in the early 1980s; from Phillies Blunt brand cigars; see blunt (adj.), which has been used of certain cigars since 19c.
Users say that the Phillies Blunt brand produces less harsh-tasting or sweeter smoke. The leaf wrapper of a Phillies Blunt is strong enough to hold together through the manipulations of making a blunt. Other brands fall apart. [http://nepenthes.lycaeum.org/Drugs/THC/Smoke/blunts.html]
bluntly (adv.) Look up bluntly at Dictionary.com
1550s, "stupidly," from blunt (adj.) + -ly (2). Meaning "directly" is from 1570s.
bluntness (n.) Look up bluntness at Dictionary.com
late 15c., "stupidity," from blunt (adj.) + -ness. Meaning "rudeness" is from c.1600.
blur (n.) Look up blur at Dictionary.com
1540s, "smear on the surface of writing;" perhaps akin to blear. Extended sense of "confused dimness" is from 1860.
blur (v.) Look up blur at Dictionary.com
1580s, and thus probably from blur (n.), but the dates are close and either might be the original. Related: Blurred; blurring.
blurb (n.) Look up blurb at Dictionary.com
used by U.S. scholar Brander Matthews (1852-1929) in 1906 in "American Character;" popularized 1907 by U.S. humorist Frank Gelett Burgess (1866-1951). Originally mocking excessive praise printed on book jackets.
Gelett Burgess, whose recent little book, "Are You a Bromide?" has been referred to above, then entertained the guests with some characteristic flashes of Burgessian humor. Referring to the word "blurb" on the wrapper of his book he said: "To 'blurb' is to make a sound like a publisher. The blurb was invented by Frank A. Munsey when he wrote on the front of his magazine in red ink 'I consider this number of Munsey's the hottest pie that ever came out of my bakery.' ... A blurb is a check drawn on Fame, and it is seldom honored.["] ["Publishers' Weekly," May 18, 1907]
blurry (adj.) Look up blurry at Dictionary.com
1855, from blur + -y (2). Related: Blurrily; blurriness.
blurt (v.) Look up blurt at Dictionary.com
1570s, probably echoic. Related: blurted; blurting. As a noun, 1570s, probably from the verb.
blush (v.) Look up blush at Dictionary.com
mid-14c., bluschen, blischen, probably from Old English blyscan "blush, become red, glow" (glossing Latin rutilare), akin to blyse "torch," from Proto-Germanic *blisk- "to shine, burn," which also yielded words in Low German (Dutch blozen "to blush") and Scandinavian (Danish blusse "to blaze; to blush"); ultimately from PIE *bhel- (1) "to shine, flash, burn" (see bleach (v.)).

For vowel evolution, see bury. Earliest recorded senses were "to shine brightly; to look, stare." Sense of "turn red in the face" (with shame, modesty, etc.) is from c.1400. Related: Blushed; blushing.
blush (n.) Look up blush at Dictionary.com
mid-14c., "a look, a glance" (sense preserved in at first blush), also "a gleam, a gleaming" (late 14c.), from blush (v.). As "a reddening of the face" from 1590s. Meaning "a rosy color" is 1590s.
bluster (n.) Look up bluster at Dictionary.com
1580s, from bluster (v.).
bluster (v.) Look up bluster at Dictionary.com
late 14c., from a Low German source, such as Middle Low German blüstren "to blow violently," East Frisian blüstern "to bluster" (see blow (v.1)). Related: Blustered; blustering.
blustery (adj.) Look up blustery at Dictionary.com
1707, from bluster (n.) + -y (2). Blustering in this sense is recorded from 1510s.
BMX Look up BMX at Dictionary.com
1978, semi-acronym from bicycle motocross.
bo tree (n.) Look up bo tree at Dictionary.com
1680s, from Sinhalese bo, from Pali bodhi, short for bodhi-taru "bo tree," literally "tree of wisdom or enlightenment" (related to Sanskrit buddhah "awakened;" see bid) + taru "tree."
boa (n.) Look up boa at Dictionary.com
late 14c., "large snake," from Latin boa, type of large serpent mentioned in Pliny's "Natural History;" origin unknown (in Middle English folk etymology associated with Greek bous "ox"). Extension to "snake-like coil of fur worn by ladies" is from 1836. The popular name boa constrictor is from 1788.
Boanerges Look up Boanerges at Dictionary.com
name given by Christ to his disciples John and James, the two sons of Zebedee (Mark iii:17), Late Latin, from Ecclesiastical Greek Boanerges, from a Galilean dialectal corruption of Hebrew bene reghesh "sons of rage" (interpreted in Greek as "sons of thunder"), from bene (see B'nai B'rith) + reghesh "commotion, tumult, throng." Applied figuratively to zealous or loud preachers.
boar (n.) Look up boar at Dictionary.com
Old English bar "boar," from West Germanic *bairaz (cognates: Old Saxon ber, Dutch beer, Old High German ber "a boar"), of unknown origin with no cognates outside West Germanic. Applied in Middle English to persons of boar-like character.
board (n.1) Look up board at Dictionary.com
Old English bord "a plank, flat surface," from Proto-Germanic *burdam (cognates: Old Norse borð "plank," Dutch bord "board," Gothic fotu-baurd "foot-stool," German Brett "plank"), from PIE *bhrdh- "board," from root *bherdh- "to cut." See also board (n.2), with which this is so confused as practically to form one word (if indeed they were not the same word all along).

A board is thinner than a plank, and generally less than 2.5 inches thick. The transferred meaning "food" (late 14c.) is an extension of the late Old English sense of "table" (compare boarder, boarding); hence, also, above board "honest, open" (1610s). A further extension is to "table where council is held" (1570s), then transferred to "leadership council, council (that meets at a table)," 1610s.
board (n.2) Look up board at Dictionary.com
"side of ship," Old English bord "border, rim, ship's side," from Proto-Germanic *bordaz (cognates: Old Saxon bord, Dutch boord, German Bord, Old High German bart, Old Norse barð), perhaps from the same source as board (n.1), but not all sources accept this. Connected to border; see also starboard.

If not etymologically related to board (n.1), the two forms represented in English by these words were nonetheless confused at an early date in most Germanic languages, a situation made worse in English because this Germanic root also was adopted as Medieval Latin bordus (source of Italian and Spanish bordo). It also entered Old French as bort "beam, board, plank; side of a ship" (12c., Modern French bord), either from Medieval Latin or Frankish, and from thence it came over with the Normans to mingle with its native cousins. By now the senses are inextricably tangled. Some etymology dictionaries treat them as having been the same word all along.
board (v.) Look up board at Dictionary.com
verb senses derived from various senses of board (n.1) and board (n.2) include "come alongside" (a ship), mid-15c. (from n.2); "put boards on, frame with boards," late 14c. (implied in boarded, from n.1); " to get onto" (a ship), 1590s, transferred from mid-19c. to stages, railway cars, aircraft, etc. (from n.2). Meaning "to be supplied with food and lodging" is from 1550s (from n.1 in transferred sense). Transitive meaning "provide with daily meals and lodging" is from 1590s. Related: Boarded; boarding.
boarder (n.) Look up boarder at Dictionary.com
1520s, "one who has food and/or lodging at the house of another," agent noun from board (v.), in the "be supplied with food" sense; meaning "one who boards (an enemy's) ships" is from 1769, from a verbal sense derived from board (n.2).
boarding (n.) Look up boarding at Dictionary.com
1530s, "supplying of meals, food and lodging," from board (n.1) in its extended sense of "food" (via notion of "table"). Boarding-school is from 1670s; boarding-house attested from 1728.
boardroom (n.) Look up boardroom at Dictionary.com
also board-room, 1731, from board (n.1) in the sense of "table where council is held" + room (n.).
boardwalk (n.) Look up boardwalk at Dictionary.com
"walkway made of boards," 1864, American English, from board (n.1) + walk (n.). As a seaside attraction from 1881, first in reference to Atlantic City, N.J.
boast (n.) Look up boast at Dictionary.com
mid-13c., "arrogance, presumption, pride, vanity;" c.1300, "a brag, boastful speech," from Anglo-French bost "ostentation," probably via Scandinavian (compare Norwegian baus "proud, bold, daring"), from Proto-Germanic *bausia "to blow up, puff up, swell" (cognates: Middle High German bus "swelling," dialectal German baustern "to swell;" Middle Dutch bose, Dutch boos "evil, wicked, angry," Old High German bosi "worthless, slanderous," German böse "evil, bad, angry"), from PIE *bhou-, variant of root *beu-, *bheu- "to grow, swell" (see bull (n.2)).

The notion apparently is of being "puffed up" with pride; compare Old English belgan "to become angry, offend, provoke," belg "anger, arrogance," from the same root as bellows and belly (n.). Related: Boasted; boasting. An Old English word for "boasting" was micelsprecende, "big talk."
boast (v.) Look up boast at Dictionary.com
early 14c., "to brag, speak arrogantly;" from the same source as boast (n.). Related: Boasted; boasting.
boastful (adj.) Look up boastful at Dictionary.com
early 14c., from boast (n.) + -ful. Related: Boastfully; boastfulness.
boat (n.) Look up boat at Dictionary.com
Old English bat "boat, ship, vessel," from Proto-Germanic *bait- (cognates: Old Norse batr, Dutch boot, German Boot), possibly from PIE root *bheid- "to split" (see fissure) if the notion is of making a boat by hollowing out a tree trunk; or it may be an extension of the name for some part of a ship. French bateau "boat" is from Old English or Norse. Spanish batel, Italian battello, Medieval Latin batellus likewise probably are from Germanic.
boatswain (n.) Look up boatswain at Dictionary.com
mid-15c., from late Old English batswegen, from bat "boat" (see boat (n.)) + Old Norse sveinn "boy" (see swain). Phonetic spelling bo'sun/bosun is attested from 1840.
BOATSWAIN. The warrant officer who in the old Navy was responsible for all the gear that set the ship in motion and all the tackle that kept her at rest. [Sir Geoffrey Callender, "Sea Passages," 1943]
bob (v.1) Look up bob at Dictionary.com
"move with a short, jerking motion," late 14c., probably connected to Middle English bobben "to strike, beat" (late 13c.), perhaps of echoic origin. Another early sense was "to make a fool of, cheat" (early 14c.). Related: Bobbed; bobbing. The sense in bobbing for apples (or cherries) recorded by 1799.
bob (n.2) Look up bob at Dictionary.com
"short hair," 1680s, attested 1570s in sense of "a horse's tail cut short," from earlier bobbe "cluster" (as of leaves), mid-14c., a northern word, perhaps of Celtic origin (compare Irish baban "tassel, cluster," Gaelic babag). Used over the years in various senses connected by the notion of "round, hanging mass," such as "weight at the end of a line" (1650s). The hair sense was revived with a shift in women's styles early 20c. (verb 1918, noun 1920). Related words include bobby pin, bobby sox, bobsled, bobcat.
bob (n.1) Look up bob at Dictionary.com
"act of bobbing," 1540s, from bob (v.1). As a slang word for "shilling" it is attested from 1789, but the signification is unknown.
bobbin (n.) Look up bobbin at Dictionary.com
1520s, from French bobine, small instrument used in sewing or tapestry-making, perhaps from Latin balbus (see babble (v.)) for the stuttering, stammering noise it made.
bobbinet (n.) Look up bobbinet at Dictionary.com
1819, from bobbin + net (n.).
bobble (v.) Look up bobble at Dictionary.com
1812, frequentative of bob (v.1). The notion is "to move or handle something with continual bobbing." Related: Bobbled; bobbling. Bobble-head as a type of doll is from 1968.