Webster's Revised Unabridged Dictionary · 1913

Prevail

Prevail , intransitive verb

[French prévaloir, Old French prevaleir, Latin praevalere; prae before + valere to be strong, able, or worth. See Valiant.]

1.
To overcome; to gain the victory or superiority; to gain the advantage; to have the upper hand, or the mastery; to succeed; -- sometimes with over or against.
When Moses held up his hand, Israel prevailed, and when he let down his hand, Amalek prevailed. — Ex. xvii. 11
So David prevailed over the Philistine. — 1 Sam. xvii. 50
This kingdom could never prevail against the united power of England. — Swift
2.
To be in force; to have effect, power, or influence; to be predominant; to have currency or prevalence; to obtain; as, the practice prevails this day.
This custom makes the short-sighted bigots, and the warier skeptics, as far as it prevails. — Locke
3.
To persuade or induce; -- with on, upon, or with; as, I prevailedon him to wait.
He was prevailed with to restrain the Earl. — Clarendon
Prevail upon some judicious friend to be your constant hearer, and allow him the utmost freedom. — Swift