There are many synonyms for the phrase "stop nagging" that can be used to politely request someone to refrain from persistent complaining or urging. Some of the most common ones include "cease pestering," "halt harping on," "refrain from badgering," "quit constantly reminding," "end repetitive whining," and "withhold incessant goading." Using these synonyms can help you communicate your need for a break from constant criticism or reminders without sounding rude or aggressive. It is important to address nagging behavior in a respectful and gentle manner to avoid damaging relationships and creating unnecessary tension.