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stumble v. stumbled, stumbling, stumbles v.intr. 1.To miss one's step in walking or running; trip and almost fall. 2.To proceed unsteadily or falteringly; flounder. See Synonyms at blunder. 3.To act or speak falteringly or clumsily. 4.To make a mistake; blunder. 5.To fall into evil ways; err. 6.To come upon accidentally or unexpectedly.