Definition from Wiktionary, the free dictionary
- (idiomatic) To convince; to persuade.
- Perhaps I can prevail upon him to change his mind.
1898, Winston Churchill, chapter 10, The Celebrity:
- The skipper Mr. Cooke had hired at Far Harbor was a God-fearing man with a luke warm interest in his new billet and employer, and had only been prevailed upon to take charge of the yacht after the offer of an emolument equal to half a year's sea pay of an ensign in the navy.