big idea


noun Informal.

any plan or proposal that is grandiose, impractical, and usually unsolicited: You're always coming around here with your big ideas.
purpose; intention; aim: What's the big idea of shouting at me?

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Origin of big idea

An Americanism dating back to 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020