loss (n.)youdaoicibaDictYouDict[loss 词源字典]
Old English los "loss, destruction," from Proto-Germanic *lausa- (see lose). The modern word, however, probably evolved 14c. with a weaker sense, from lost, the original past participle of lose. Phrase at a loss (1590s) originally refers to hounds losing the scent. To cut (one's) losses is from 1885, originally in finance.[loss etymology, loss origin, 英语词源]