Have a big mouth phrase
Also: be/ have got a big mouth.
To talk constantly and loudly that annoy other people; to tend to tell things that should be kept secret.
Everyone refused to talk to Mary because she has a big mouth.
I must admit that I had a big mouth before I reached adulthood.
Having a big mouth will just make you lose others' respect.
Used to imply that one talks for such a long time that someone becomes tired or bored
Said of someone who talks constantly.
Used to express efforts to expain or talk about something again and again but one doesn't listen to or change their opinion
Talk so much that the listener becomes exhausted or bored
The verb "have" must be conjugated according to its tense.
The origin of this phrase is not clear. It gives an image of someone whose mouth is hanging open. An open mouth would not be able to keep secrets inside.