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big idea

noun, Informal.
1.
any plan or proposal that is grandiose, impractical, and usually unsolicited:
You're always coming around here with your big ideas.
2.
purpose; intention; aim:
What's the big idea of shouting at me?
Origin
1920-1925
1920-25, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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