harp on
反复提及或强调某件事情，尤其是让人讨厌的或重复的事情
口语·表达抱怨或厌烦
英文释义
to persistently dwell on or discuss a particular subject, often in a critical or complaining manner
例句
My dad always harps on about me cleaning my room. It's so annoying!
典故来源
源自竖琴（harp）反复拨弦的动作，比喻像弹琴一样不停重复某个话题。