harp on
US /hɑːrp ɑːn/
UK /hɑːrp ɑːn/

1.
insistir em, martelar em
to talk or write persistently and tediously on a particular subject
:
•
He keeps harping on about the good old days.
Ele continua insistindo nos bons velhos tempos.
•
I wish she wouldn't harp on my mistakes.
Eu gostaria que ela não insistisse nos meus erros.