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Related to done deal: Buy and Sell
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!
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.
a done deal
If something such as a plan or project is a done deal, it has been completed or arranged and it cannot be changed. He called a journalist to announce that his nomination was a done deal. The pact is far from being a done deal. It must be ratified by the legislative bodies of all three countries.
a done deala plan or project that has been finalized or accomplished.
1991 New Yorker The French are still overreacting to German unification, even though it is a done deal.
a done ˈdeal(especially American English) used to describe a decision, an arrangement, a project, etc. that is completed and cannot be changed: The managing director denied that the merger was a done deal, and said they were still in negotiations.
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.