<p><strong>Verb (used without object)</strong></p><ul><li>to strike the foot against something, as in walking or running, so as to stagger or fall; trip.</li><li>to walk or go unsteadily: to stumble down a dark passage.</li><li>to make a slip, mistake, or blunder, especially a sinful one: to stumble over a question; to stumble and fall from grace.</li><li>to proceed in a hesitating or blundering manner, as in action or speech (often followed by along).</li><li>to discover or meet with accidentally or unexpectedly (usually followed by on, upon, or across): They stumbled on a little village.</li><li>to falter or hesitate, as at an obstacle to progress or belief.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to cause to stumble; trip.</li><li>to give pause to; puzzle or perplex.</li></ul><p><strong>Noun</strong></p><ul><li>the act of stumbling.</li><li>a moral lapse or error.</li><li>a slip or blunder.</li></ul>