Stammer

[Sarah]

To make involuntary stops in uttering syllables or words; tohesitate or falter in speaking; to speak with stops and diffivulty;to stutter.I would thou couldst stammer, that thou mightest pour this concleadman out of thy mouth, as wine comes out of a narrow-mouthed bottle,either too much at once, or none at all. Shak.

[Sarah]

To speak or utter with sudden involuntary pauses and repetitions of initial letters. this mainly occurs with people who generally talk fast and they are known to be short tempered. Most times, stammering develops from childhood.

[Hina Muqadas]

Speak with sudden involuntary pauses and a tendency to repeat the initial letters of words.