‘At the drop of a hat’
Done immediately, without hesitation. “She has always been helpful and would pop round at the drop of a hat if I needed her”
‘To keep it under your hat’
To be discreet, to keep a piece of information private. “I think my daughter has got her promotion, but keep it under your hat, no one knows yet”.
‘To eat your hat’
To demonstrate surprise at something you thought was impossible. “If that horse wins I’ll eat my hat!”
‘Hold onto your hat!’
Preparation for some amazing news! “Ok, hold onto your hat, you’re not going to believe this!”
‘To take your hat off to somebody’
To demonstrate respect or admiration for something. “I really take my hat off to you, that was not an easy task”.