lose

• vt.無駄にする；甘やかす；失わせる；失う；逃す
• vi. 失敗する；損失を被る
• n.（失）人名；（英）Lose；（出）Loser

古英語のlos, 失う, 破壊する, から。PIE*leu, 切る, 切る, 切り離す, ほぐす, ほぐす, -lessと語源的には同じ。おそらくPIE*skel, 切る, 切る, からさらに派生したもので、語源的にはscale, scalperと同じ。

lose

lose: [OE] The verb lose originated as a derivative of the Old English noun los ‘loss’, which went back ultimately to the same Indo-European source (*lau-, *leu-, lu-) as produced English loose and the suffix -less. In Old English it was losian, which eventually ousted the original lēosan to become the only verb for ‘lose’. The noun los died out before the Middle English period, and was replaced by loss [14], probably a derivative of the past participle lost. The past participle of lēosan ‘lose’ was loren, which survives in forlorn and love-lorn.
=> loose

lose (v.)

Old English losian "be lost, perish," from los "destruction, loss," from Proto-Germanic *lausa- (cognates: Old Norse los "the breaking up of an army;" Old English forleosan "to lose, destroy," Old Frisian forliasa, Old Saxon farliosan, Middle Dutch verliesen, Old High German firliosan, German verlieren), from PIE root *leu- "to loosen, divide, cut apart, untie, separate" (cognates: Sanskrit lunati "cuts, cuts off," lavitram "sickle;" Greek lyein "to loosen, untie, slacken," lysus "a loosening;" Latin luere "to loose, release, atone for, expiate").

Replaced related leosan (a class II strong verb whose past participle loren survives in forlorn and lovelorn), from Proto-Germanic *leusanan (cognates: Old High German virliosan, German verlieren, Old Frisian urliasa, Gothic fraliusan "to lose").

Transitive sense of "to part with accidentally" is from c. 1200. Meaning "fail to maintain" is from mid-15c. Meaning "to be defeated" (in a game, etc.) is from 1530s. Meaning "to cause (someone) to lose his way" is from 1640s. To lose (one's) mind "become insane" is attested from c. 1500. To lose out "fail" is 1858, American English. Related: Lost; losing.

1. Some battles you win，some battles you lose .

勝敗は兵家の常である。

米ドラマ『ライフ?ビッグバン』

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2.He appealed to his countrymen not to lose heart.

彼は自分の同胞に自信を失わないように呼びかけた。

3.Torn muscles retract，and lose strength，structure，and tightness.

引き裂かれた筋肉は収縮し、元の力、構造、締付度を失う。

4.Having children was the quickest way to lose your street cred.

子供を産むことは、自分を若くおしゃれにしないための最速の方法です。

5.I can lose a few pounds without resorting to daft diets.

私は狂ったように節食しなくても数ポンド軽減できます。