- strain (v.)
- "to stretch, draw tight," c.1300, from present participle stem of Old French estreindre "bind tightly, clasp, squeeze," from Latin stringere (2) "bind or draw tight," from PIE root *strenk- "tight, narrow; pull tight, twist" (cf. Lithuanian stregti "congeal;" Greek strangein "twist;" Old High German strician "mends nets;" Old English streccian "to stretch," streng "string;" German stramm, Dutch stram "stiff"). Sense of "press through a filter" is from early 14c. (implied in strainer); that of "lay undue stress on, make a forced interpretation of" is from mid-15c. Related: Strained; straining.
- strain (n.2)
- "line of descent," Old English strion, streon "gain, begetting," from Proto-Germanic *streun- "to pile up," from PIE root *stere- "to spread, extend, stretch out" (see structure (n.)). Applied to animal species first in c.1600.
- strain (n.1)
- "injury caused by straining," 1550s, from strain (v.). The meaning "passage of music" (1570s) probably developed from a verbal sense of "to tighten" the voice, originally the strings of a musical instrument (late 14c.).