what's the big idea
idiom
informal
—used to ask why someone is doing or saying something
Hey! What's the big idea!?
Cite this Entry
“What's the big idea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/what%27s%20the%20big%20idea. Accessed 31 Oct. 2025.
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Merriam-Webster unabridged
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