1. the opening in the face through which food is taken in and sounds are made
2. the opening or entrance to something
3. the place where a river enters the sea or a lake

1. to say something without meaning it or without understanding it
2. to move the lips as if speaking but without making sound

Examples

• She opened her mouth to speak.
• The dentist examined his mouth carefully.
• The mouth of the cave was hidden by vines.
• We camped near the mouth of the river.
• Don’t just mouth the words during the song.
• The actor was mouthing his lines silently.
• Keep your mouth shut about this secret.