a horse, esp one that is old or in poor condition [Middle English nagge; related to Dutch negge small horse]
verb intrans(often + at) to find fault incessantlysaid of a pain or worry: to be a persistent source of annoyance or discomfort verb transto subject (a person) to constant scolding or urgingnagger nounnagging adjnaggingly adv[orig dialect in the sense ‘to gnaw’, prob of Scandinavian origin]