stutter (v.)

1560s, frequentative form of stutt "to stutter," from Middle English stutten "to stutter, stammer" (late 14c.), cognate with Middle Low German stoten "to knock, strike against, collide," from Proto-Germanic *staut- "push, thrust" (source also of Old Saxon stotan, Old High German stozan, Gothic stautan "to push, thrust;" German stutzen "to cut short, curtail; to stop short, hesitate," Dutch stuiten "to stop, check, arrest, stem."), from PIE *(s)teu- (1) "to hit, beat, knock against" (see steep (adj.)). The noun is attested from 1854. Related: Stuttered; stuttering; stutterer.

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Definitions of stutter from WordNet
stutter (v.)
speak haltingly;
Synonyms: bumble / stammer / falter
stutter (n.)
a speech disorder involving hesitations and involuntary repetitions of certain sounds;
Synonyms: stammer