v. & n.
v. (nagged, nagging) 1 a tr. annoy or irritate (a person) with persistent fault-finding or continuous urging. b intr. (often foll. by at) find fault, complain, or urge, esp. persistently. 2 intr. (of a pain) ache dully but persistently. 3 a tr. worry or preoccupy (a person, the mind, etc.) (his mistake nagged him). b intr. (often foll. by at) worry or gnaw.
n. a persistently nagging person. nagger n. naggingly adv.
[ of dial., perh. Scand. or LG, orig.: cf. Norw. & Sw. nagga gnaw, irritate, LG (g)naggen provoke ]