lose [keep, preserve] one's sanity
正気を失う［保つ］
lose one's self-control
自制心をなくす
lose one's sight [voice]
視覚［声］を失う
lose [save] one's sight
視力を失う［救う］
lose one's stripes
降格される
lose one's temper [cool, rag]
腹を立てる
lose one's temper with a person [over a matter]
人［事］に腹を立てる
lose one's vigor
元気をなくす
lose one's virginity
処女［童貞］を失う
lose one's way
道に迷う
