O.E.
losian "be lost, perish," from
los "destruction, loss," from P.Gmc.
*lausa (cf. O.N.
los "the breaking up of an army"), from PIE base
*leu- "to loosen, divide, cut apart, untie, separate" (cf. Skt.
lunati "cuts, cuts off,"
lavitram "sickle;" Gk.
lyein "to loosen, untie, slacken,"
lysus "a loosening;" L.
luere "to loose, release, atone for"). Replaced related
leosan (a class II strong verb whose pp.
loren survives in
forlorn and
love-lorn), from P.Gmc.
*leusanan (cf. O.H.G.
virliosan, Ger.
verlieren, O.Fris.
urliasa, Goth.
fraliusan "to lose"). Transitive sense of "to part with accidentally" is from c.1200. Meaning "to be defeated" (in a game, etc.) is from 1530s. To
lose (one's) mind "become insane" is attested from c.1500. To
lose out "fail" is 1858, Amer.Eng.