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prevail as in: she prevailed upon him
The lobbyist prevailed upon the president to sign the legislation.
The expression "prevail upon your patience" or "prevail upon your kindness" means to appeal to the listeners patience or kindness as a method of persuasion.
Prevail has many reasonably common, but diverse senses. Accordingly, it is generally recommended that you just learn the sense (or senses) that currently interest you.