informal

if you have a big mouth, you talk too much, especially about things that should be secret.

Helen's got such a big mouth - the news'll be all over the town by tonight.

I knew I shouldn't have mentioned the letter. Oh dear, me and my big mouth!

• is beyond me
• I shudder to think
• is in business
• is not a bed of roses
• I stand corrected
• is that a fact
• is your bag
• I take my hat off to
• I take my hat off to someone
• I take the Fifth
• I take the Fifth Amendment
• it beats me
• it doesn't hurt to
• it doesn't hurt to do something
• it doesn't take a rocket scientist
• it doesn't take a rocket scientist to
• it doesn't take a rocket scientist to do something
• I tell you
• it escapes
• it escapes me
• It goes without saying.
• it goes without saying
• I thought as much!
• be off your rocker
• be off your trolley