Gloves are off
A situation which includes a serious dispute or even fight in order to achieve something.
Ex: I have been a friendly person so far, but now the gloves are off!
Below the belt
If something is below the belt, then we are talking about unacceptable behavior.
Ex: He told her that she was stupid which she felt as a hit below the belt.
Be tied to your mother’s/wife’s apron strings
Refers to people who are not capable of making decision independently or without their mother or wife.
Ex: He is 45 years old but he’s still tied to his mother’s apron strings.
Put a sock in it!
Impolite way of telling someone to be quiet.
Ex: Can’t you stop talking! Put a sock in it!
Big girl’s blouse
Used to insult a person who other people believe is behaving in a weak manner.
Ex: ‘I can’t help you carrying these books’ ‘Oh, please stop being such a big girl’s blouse.’
Keep it under your hat
To keep something a secret.
Ex: I’ve heard that Jane is having an affair but keep it under your hat.