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done deal
done deal
Something that has been decided or finalized. Once we sign those papers, the sale of the house will be a done deal. I had no idea I'd have to make more payments to receive the merchandise—I thought it was a done deal!
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.
done deal
n. a completed deal; something that is settled. The sale of the property is a done deal. There is nothing that can be changed now.