<p><strong>Verb</strong></p><ul><li>(used without object) to speak with involuntary breaks and pauses, or with spasmodic repetitions of syllables or sounds.</li><li>(used with object) to say with a stammer (often followed by out).</li></ul><p><strong>Noun</strong></p><ul><li>a stammering mode of utterance.</li><li>a stammered utterance.</li></ul>