harp on one string

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harp on one string

To dwell tediously and repeatedly upon a single subject or topic, especially in complaint. Likened to playing the same note over and over again on a harp. Mark is always harping on one string about how little money he makes. I wish he would come up with something new to talk about! I get it, you don't like your job. Quit harping on one string!
See also: harp, on, one, string