mouth1 S2 W1 plural mouths [countable]
the part of your face which you put food into, or which you use for speaking:
He lifted his glass to his mouth.
The old man had a cigarette dangling from the corner of his mouth.
Liam was fast asleep with his mouth wide open.
She put her hand to her lips , trying not to laugh with her mouth full (=with food in her mouth).
She kissed him full on the mouth (=directly on the mouth).
I burnt the roof of my mouth (=the top inside part) on some hot soup.
She stared at him open-mouthed (=looking very surprised or shocked).
Karen felt dry-mouthed and sick.
to not tell other people about a secret:
He demanded £2000 to keep his mouth shut.
to not say something even if you think it:
I wished that I'd kept my mouth shut.
to prepare to speak:
'I'll go,' Travis said quickly before she could open her mouth.
open your mouth to say/speak/protest etc
Julia opened her mouth to reply, but they were interrupted.
4 spoken informal
used to tell someone not to speak in such a rude way
the entrance to a large hole or cave:
As the train entered the mouth of the tunnel, the lights came on.
the part of a river where it joins the sea:
the mouth of the River Tees
the open part at the top of a bottle or container
if someone has a big mouth, they say too much or tell another person's secrets
used to criticize yourself or another person for saying something that should not have been said:
Oops, I shouldn't have said that. Me and my big mouth.
someone who you must provide food for, especially one of your children:
To these parents, a new baby is just another hungry mouth.
if food makes your mouth water, it smells or looks so good you want to eat it immediately: ➔ mouth-watering
The smell of the cooked fish made her mouth water.
Tim's looking very down in the mouth.
used humorously when a small child has just said something clever or interesting
14 British English spoken
if someone is all mouth, they talk a lot about what they will do but are not brave enough to actually do it