吃后悔药

吃后悔药

Literally means:

eat regret medicine

Actually means:

be regretful

It figuratively means feeling regretful about something is done before. Since remorse is useless, this phrase often appears in the negative form or inside question to remind others that one must think twice before doing anything risky.

比喻对自己做过的事很后悔。因为后悔是没有用的，所以多用于疑问或者否定形式，以提醒人做每件事情之前都要慎重考虑。