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Related to done deal: Buy and Sell
a 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!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
done deal, a
An irreversible agreement, a final decision or compact. This relatively new synonym for the long-used fait accompli dates only from the late 1970s, but according to William Safire, it had a near predecessor in a done thing. The latter surfaced about 1700, and Dickens used it: “It was a done thing between him and Scrooge’s nephew” (A Christmas Carol, 1843). The current cliché is also often used in the negative (not a done deal), as in “We can interview another architect; it’s not a done deal, you know.”
See also: done
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer