verb
to persistently talk or complain about something
preposition
used to indicate the topic or subject of the persistent talk or complaint
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The speaker continued to harp on the importance of budgetary constraints in his presentation.
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Why do you always harp on about cleaning your room?
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Stop harping on me about going out tonight, I already said I can't.
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She couldn't help but harp on the mistake she made, replaying it in her mind over and over.