
Prevail upon to do
Convincing Tone
The phrase implies a gentle, but firm way to get someone to agree to do something.

She was able to prevail upon her brother to attend the reunion.
Persistence
Using 'prevail upon' suggests repeated efforts rather than a one-time request.

He had to prevail upon them several times to get the signatures needed.
Formal Context
It's a formal expression often found in written or official contexts, less common in casual speech.

The council was prevailed upon to reconsider the zoning application.
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