"ritually fit or pure" (especially of food), 1851, from Yiddish kosher, from Hebrew kasher "fit, proper, lawful," from base of kasher "was suitable, proper." Generalized sense of "correct, legitimate" is from 1896.
权威例句
1. Acting was not a kosher trade for an upper-class girl.
演戏对一个出身上流社会的女孩儿来说不是个合适的职业。
2. I guessed something wasn't quite kosher.
我觉得有点不对劲儿。
3. Their business deals are not always completely kosher.