Definition of "nag" []

• To annoy by constant scolding, complaining, or urging. (verb-transitive)
• To torment persistently, as with anxiety or pain. (verb-transitive)
• 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. (verb-intransitive)
• One who nags. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Cathy Gildiner -- the nag from the other side of the lake,"
• "I had nine messages I needed to reply to, and six messages I need to print. 13 messages remained in my inbox that required action of some sort, which is a number I can live with and a realistic number of tasks to have in a short-term nag list."
• "Gee, and so far in my story, the main nag is the guy saying, “why can’t we call the cavalry to ride in?”"