"Nagging" refers to the act of persistently annoying or criticizing someone, often in an incessant or bothersome manner. It can involve constant reminders or complaints aimed at persuading someone to change their behavior or to do something, which might lead to feelings of irritation or frustration for the person being nagged.
The term "nagging" originates from the verb "nag," which is believed to come from the Scandinavian term "gnaga," meaning "to gnaw." It has been used in English since the late 16th century to describe the action of persistently finding fault or complaining about someone or something.