I beg to differ

US /aɪ bɛɡ tə ˈdɪfər/
UK /aɪ bɛɡ tə ˈdɪfər/
"I beg to differ" picture
1.

eu discordo, com a devida vênia, discordo

a polite way of saying that you do not agree with someone

:
You say it's a good idea, but I beg to differ.
Você diz que é uma boa ideia, mas eu discordo.
He claimed the report was accurate, but I beg to differ.
Ele alegou que o relatório era preciso, mas eu discordo.