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Related to last laugh: have the last laugh
the last laugh
A victory or vindication achieved in the face of someone's doubt, derision, or mockery. After so many people dismissed her dream of becoming an actress, the global superstar has truly had the last laugh. Everyone at my old job laughed at me for pursuing a career in making games for mobile phones. But I had the last laugh, as I made nearly $4.5 million off my very first game.
*last laugh (on someone)
Fig. laughter or ridicule at someone who has laughed at or ridiculed you. (*Typically: get ~; have ~; give someone ~.) John laughed when I got a D on the final exam. I got the last laugh, though. He failed the course. Mr. Smith said I was foolish when I bought an old building. I had the last laugh when I sold it a month later for twice what I paid for it.