noun
a speech disorder characterized by involuntary pauses and repetitions of sounds, syllables, or words
verb
present participle form of the verb 'stammer', which means to speak with involuntary pauses or repetitions
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The professor noticed the student stammering during the presentation.
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I could tell he was nervous because he started stammering while talking to the girl he liked.
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Why are you stammering so much? Just spit it out already!
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Her heart was stammering with excitement as she waited for the results.