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Origin of big deal
Words nearby big deal
British Dictionary definitions for big deal
Idioms and Phrases with big deal
A matter of great interest or importance, as in Performing in Symphony Hall is a big deal for everyone in the chorus. [c. 1940] Also see under make a federal case out of.
So what? Who cares? For example, So you got the job after all—well, big deal! This use of the phrase as an ironic interjection dates from approximately the same time.