stammer
intransitive-verb
UK: /ˈstæm.ər/
US: /ˈstæm.ɚ/
To speak with difficulty, repeating sounds or words.
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I stammer when I am nervous.
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He began to stammer, unable to explain the sudden change of plan.
To hesitate or falter in speech, often due to nervousness or excitement.
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She stammered an apology for being late.
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During the presentation, he began to stammer, losing his train of thought.