<p><strong>Verb</strong></p><ul><li>to annoy by persistent faultfinding, complaints, or demands.</li><li>to keep in a state of troubled awareness or anxiety, as a recurrent pain or problem.</li></ul><p><strong>Noun</strong></p><ul><li>a person who nags, especially habitually.</li><li>an act or instance of nagging.</li></ul>