done deal
An irrevocable agreement, as in Once you've signed the lease, it's a done deal. This slangy expression, first recorded in 1979, may have come from done thing, originating in the late 1600s.
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Whomever vs. WhoeverRaise your hand if you’ve had the who vs. whom argument. Isn’t it time to put that struggle to rest? Whoever is a pronoun that describes someone who performs an action, while whomever is a pronoun that describes someone who receives an action. Both whoever and whomever are interrogative pronouns that deal with people. Whoever Whoever is a subjective pronoun: It describes an unknown person …
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The American Heritage® Idioms Dictionary
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