How is “a done deal” used?

In Zero Effect (1998), one line is: “... it's a done deal.”

Which movie is “a done deal” from?

The clip at the top of this page is from Zero Effect (1998).

... it's a done deal.

6 作品で登場 · 1 本目

イディオム

an agreement or a plan that has been finally completed or agreed

6 本の映画に登場

an agreement or a plan that has been finally completed or agreed
The merger is by no means a done deal yet.

定義：Oxford Advanced Learner's Dictionary 第 9 版