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?
Origin of big idea
An Americanism dating back to 1920–25
Words nearby big idea
big hair,
big head, have a,
big hitter,
big hook,
big house,
big idea,
big ike,
big kahuna,
big labor,
big laurel,
big league