The opening of a creature through which food is ingested.

“"Open your mouth and say 'aah'," directed the doctor.”

The end of a river out of which water flows into a sea or other large body of water.

“The mouth of the river is a good place to go birdwatching in spring and autumn.”

An outlet, aperture or orifice.

“The mouth of a cave”

To speak; to utter.

“He mouthed his opinions on the subject at the meeting.”

To make the actions of speech, without producing sound.

“The prompter mouthed the words to the actor, who had forgotten them.”

To utter with a voice that is overly loud or swelling.