stammer
US /ˈstæm.ɚ/
UK /ˈstæm.ɚ/

1.
to speak with involuntary pauses and repetitions of initial consonants or syllables and difficulty in articulating words
:
•
He tends to stammer when he's nervous.
•
She would often stammer over her words when speaking in public.
1.
a tendency to stammer
:
•
He spoke with a slight stammer.
•
Her nervousness caused a noticeable stammer in her presentation.