RhymeZone: overmatch definitions

Definitions of overmatch:

verb: To match more than intended.
verb: To be more than equal to or a match for, to surpass; hence, to conquer, vanquish.
verb: To marry to a superior.
noun: A match in which one opponent is greatly superior to the other.
noun: An opponent who is more than a match for another; one who cannot be defeated.

(Definitions from Wiktionary)