功败垂成（功敗垂成）　

◎ 功败垂成 gōngbài-chuíchéng

[There‘s many a slip between the cup and the lip;fail in a great undertaking on the verge of success] 功业即将取得成就之时突然失败了

毋使临渴而掘井,功败垂成。——《孽海花》

我明白,这个向来有泪不轻弹的硬汉,之所以伤心落泪,是在为自己那努力多年而功败垂成的事业感到惋惜