v. To annoy by constant scolding, complaining, or urging.v. To torment persistently, as with anxiety or pain.verb-intransitive. To scold, complain, or find fault constantly: nagging at the children. verb-intransitive. To be a constant source of anxiety or annoyance: The half-remembered quotation nagged at my mind. n. One who nags.n. A horse, especially:n. An old or worn-out horse.n. Slang A racehorse.n. Archaic A small saddle horse or pony.