To speak with difficulty, repeating sounds or words.
Stuttering can make people feel nervous or unsure, but it's okay and normal for some people.
Examples:
He stuttered when he tried to say his name.
She stuttered on the phone.
The boy stuttered when he talked to the teacher.
The cat stuttered when it tried to meow.
The robot stuttered when it tried to speak.
She stuttered so much, it took a long time to say her sentence.