吞後悔藥

Simplified: 吞后悔药

tūnhòuhuǐyào ㄊㄨㄣ ㄏㄡˋ ㄏㄨㄟˇ ㄧㄠˋ

    • to wish one could undo a mistake

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
to swallow a regret medicine
Meaning
A variant of 吃后悔药: to wish one could undo a mistake, which is impossible.

Sources