stammeryoudaoicibaDictYouDict
stammer: [OE] To stammer is etymologically to be ‘impeded’ in speech. The word comes (along with Dutch stameren) from a prehistoric West Germanic *stamrōjan, which was derived from the base *stam-, *stum- ‘check, impede’ (source also of English stem ‘halt, check’ and stumble).
=> stem, stumble
stammer (v.)youdaoicibaDictYouDict
Old English stamerian "to stammer," from Proto-Germanic *stamro- (cognates: Old Norse stammr "stammering," Old Saxon stamaron, Gothic stamms "stammering," Middle Dutch and Dutch stameren, Old High German stammalon, German stammeln "to stammer," a frequentative verb related to adjective forms such as Old Frisian and German stumm "mute"). Related: Stammered; stammerer; stammering; stammeringly.
stammer (n.)youdaoicibaDictYouDict
1773, from stammer (v.).