tromper

to deceive, lead astray, mislead; to distract oneself from; to make a mistake, be wrong

“New York est la capitale des États-Unis. Ah non, je me trompe, c'est Washington.” — New York is the capital of the United States. Wait, my mistake, it's Washington.

Inherited from Middle French tromper, from Old French tromper (“to tramp, trump, delude”, literally “to play on the trumpet”), from trompe (“trump, trumpet”), from Frankish *trumpa (“trump, trumpet”), from a common Germanic word akin to Old High German trumba, trumpa (“trump, trumpet”), ultimately imitative. More at tramp, tromp, trump.