idiom · specifically referring to a broken relationship or marriage that cannot be restored or reunited

由于长期的误会与争吵，他们夫妻间的感情已是覆水难收。

idiom · what is done cannot be undone; refers to words spoken or actions taken that cannot be retracted or reversed

话已经说出口了，覆水难收，你再后悔也没用。