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Thinking of a comeback too late; the shortened version of the French term L'esprit de l'escalier or l'esprit d'escalier ("staircase wit")

Can also be used to describe the feeling you get after you walk away from a situation and think of the perfect thing to say.
Person 1: Why didn't you say anything.
Person 2: I had a moment of espeir, I couldn't think of anything until he left
by Sytry October 10, 2017
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