stammer

/หˆstรฆmษ™/
noun
  1. 1

    The involuntary repetition of a sound in speech.

verb
  1. 1

    To keep repeating a particular sound involuntarily during speech.

  2. 2

    To utter with a stammer, or with timid hesitancy.

    โ€œHe blushed, and stammered a few words of apology.โ€

Synonyms

Source: https://en.wiktionary.org/wiki/stammer