harp on

US /hɑːrp ɑːn/
UK /hɑːrp ɑːn/
"harp on" picture
1.

しつこく言い続ける, 繰り返し話す

to talk or write persistently and tediously on a particular subject

:
He keeps harping on about the good old days.
彼は昔の良き時代についてしつこく言い続ける
I wish she wouldn't harp on my mistakes.
彼女が私の間違いについてしつこく言わないでほしい。