一失足成千古恨 [ㄧ ㄕ ㄗㄨˊ ㄔㄥˊ ㄑㄧㄢ ㄍㄨˇ ㄏㄣˋ; yi1 shi1 zu2 cheng2 qian1 gu3 hen4] lit. one wrong step causes thousand hatred (idiom) A single slip may cause lasting sorrow. ◄ ►