harp on

phrasal verb·1 sense·particle on

Meanings

1

Talk repeatedly and tiresomely

Why “on”? Sliding forward along the surface. Motion that keeps going on and on.

She keeps harping on about the same thing.
She keeps tirelessly bringing up the same topic over and over.
He keeps harping on about the broken gate.
He keeps bringing up the broken gate again and again.

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