esprit de l'escalier

/EH0 S P R IY1 D IY0 EH0 L EH0 S K AA0 L IY0 ER0/
noun
  1. 1

    The phenomenon when a conversational rejoinder or remark only occurs to someone after the opportunity to make it has passed.

Source: https://en.wiktionary.org/wiki/esprit%20de%20l'escalier, https://en.wiktionary.org/wiki/l'esprit%20de%20l'escalier