v. & n.
v. 1 intr. stammer, esp. by involuntarily repeating the first consonants of words. 2 tr. (often foll. by out) utter (words) in this way.
n. 1 the act or habit of stuttering. 2 an instance of stuttering. stutterer n. stutteringly adv.
[ frequent. of ME (now dial.) stut f. Gmc ]