informal

something that you say when you want to know why someone has done something that annoys you.

What's the big idea? That's my lunch you're eating.

• in place
• in pocket
• in point of fact
• in practice
• in prime
• in principle
• in print
• in progress
• in question
• inquire into
• inquire into something
• in reality
• in reduced circumstances
• in reference to
• in reference to something
• in relation to
• in relation to something
• in reserve
• in retrospect
• in return
• in return for
• in return for something
• in right mind
• in safe hands
• ins and outs