1N-COUNT 棺材;灵柩 A coffin is a box in which a dead body is buried or cremated. 棺材;灵柩
2PHRASE 促使…失败(或完结)的因素 If you say that one thing is a nail in the coffin of another thing, you mean that it will help bring about its end or failure. 促使…失败(或完结)的因素
A fine would be the final nail in the coffin of the airline. [+ of]