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nag1 / nag/ • v. (nagged , nag·ging ) [tr.] annoy or irritate (a person) with persistent fault-finding or continuous urging: she constantly nags her daughter about getting married | she nagged him to do the housework | [intr.] he's always nagging at her for staying out late. ∎  [often as adj.] (nagging) be persistently painful, troublesome, or worrying to: there was a nagging pain in his chest | [intr.] something nagged at the back of his mind. • n. a person who nags someone. ∎  a persistent feeling of anxiety: he felt once again that little nag of doubt. DERIVATIVES: nag·ger n. nag·ging·ly adv. nag·gy adj. nag2 • n. inf., often derog. a horse, esp. one that is old or in poor health. ∎  archaic a horse suitable for riding as opposed to a draft animal.