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English definition of “stammer”

stammer

verb [I/T]  /ˈstæm·ər/ us  
to speak or say something with unusual pauses or repeated sounds; stutter: [I] He stammers when he is nervous.
stammer
noun [U]  /ˈstæm·ər/ us  
Robert has a slight stammer which was much worse when he was younger.
(Definition of stammer from the Cambridge Academic Content Dictionary © Cambridge University Press)
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