lash (n.) Look up lash at Dictionary.com
c.1300, las "a blow, a stroke," later "flexible part of a whip" (late 14c.), possibly imitative. The verb might be the source of the noun.
lash (v.2) Look up lash at Dictionary.com
"bind," 1620s, originally nautical, from Middle French lachier, from Old French lacier "to lace" (see lace (v.)). Related: Lashed; lashing.
lash (v.1) Look up lash at Dictionary.com
"to strike with a whip," c.1300, "to deal a blow;" later "to whip" (late 14c.); see lash (n.). Lash out "to strike out violently" is from 1560s. Related: Lashed; lashing.