have a big mouth

have a big mouth

to be a gossiper; to be a person who tells secrets. Mary has a big mouth. She told Bob what I was getting him for his birthday. You shouldn't say things like that about people all the time. Everyone will say you have a big mouth.
See also: big, have, mouth

have a big mouth

tv. to speak loudly and openly in public; to tell secrets. (Have got can replace have.) He has a big mouth. Don’t tell him anything you don’t want everybody else to know.
See also: big, have, mouth