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stumble
noun
°a fall or trip.
°an error or blunder.
verb
°to trip or fall.
"He stumbled over a rock."
°to make a mistake or have trouble.
"I always stumble over verbs in Spanish."
synonyms: blooper, blunder, boo-boo, defect more» , error, fault, faux pas, fluff, gaffe, lapse, mistake, slip, thinko