1. annoy or irritate (a person) with persistent fault-finding or continuous urging: "she constantly nags her daughter about getting married"Similarharasskeep on atgo on atharp on atbadgerkeep aftergive someone a hard timeget on someone's backpersecutechivvyhoundharrybullypick oncriticizefind fault withkeep complaining tomoan (on) atgrumble athenpeckcarp atscoldupbraidberateinformal:hasslerideheavy
▪ be persistently painful, troublesome, or worrying to:"something nagged at the back of his mind"
noun
1. a person who nags someone.
▪ a persistent feeling of anxiety:"he felt once again that little nag of doubt"
Word Originearly 18th century (originally dialect in the sense ‘gnaw’): perhaps of Scandinavian origin; compare with Norwegian and Swedish nagga ‘gnaw, irritate’. The sense ‘harass constantly’ dates from the early 19th century.