功ㄍㄨㄥgōng敗ㄅㄞˋbài垂ㄔㄨㄟˊchuí成ㄔㄥˊchéng

事情在即將成功時失敗了。《晉書·卷七九·謝安傳》：「降齡何促，功敗垂成，拊其遺文，經綸遠矣。」也作「功墮垂成」。似功虧一簣、前功盡棄反大功告成

英to fail within sight of success (idiom); last-minute failure, to fall at the last hurdle, snatching defeat from the jaws of victory