To speak with involuntary pauses, hesitations, or repetition of sounds, or to speak in a hesitant manner.
From Old English 'stamerian' or German 'stammen,' of uncertain ultimate origin but possibly imitative of the stuttering sound. The -er variation indicates a habitual or characteristic action.
Historically, people who stammered were sometimes thought to have a disability or shameful condition, but modern research shows it's a neurological difference in how the brain coordinates speech—and many successful people are stammerers who've learned to manage it!
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