L'esprit de l'escalier
L'esprit de l'escalier or l'esprit d'escalier (UK: , US: , French: [lɛspʁi d(ə l)ɛskalje]; lit. 'staircase wit') is a French term used in English for the predicament of thinking of the perfect reply too late. == Origin == This name for the phenomenon comes from French encyclopedist and philosopher Denis Diderot's description of such a situation in his "Paradoxe sur le comédien" ("Paradox of the Actor").