the opening through which food is taken in and vocalizations emerge
"he stuffed his mouth with candy"
the externally visible part of the oral cavity on the face and the system of organs surrounding the opening
"she wiped lipstick from her mouth"
an opening that resembles a mouth (as of a cave or a gorge)
"he rode into the mouth of the canyon"
"they built a fire at the mouth of the cave"
the point where a stream issues into a larger body of water
"New York is at the mouth of the Hudson"
a spokesperson (as a lawyer)
"The defense lawyer asked his mouth to tell the jury exactly what he wanted them to hear without him speaking directly."
The opening of a creature through which food is ingested.
"The curious kitten poked its wet nose near my finger to sniff out the treat waiting at the corner of its mouth."
In plain English: A mouth is the opening on your face where you eat, drink, and speak.
"He smiled broadly to show off his white teeth."
Usage: Use "mouth" to refer to the body part used for eating and speaking in humans and animals. Do not use it to mean an entrance or hole unless you are specifically describing a literal biological opening.
To speak; to utter.
"She kept her mouth shut during the argument because she knew there was no way to win."
In plain English: To mouth means to speak with your lips without making any sound.
"She mouthed the words silently so she wouldn't wake the baby."
Usage: Use "mouth" when you silently form words with your lips without making sound, such as mouthing a secret or mouthing words during a performance. Do not use it to describe speaking aloud, which requires the word "speak."
The word "mouth" comes from the Old English mūþ, which traces back to a Proto-Indo-European root meaning "to chew" or "jaw." It entered Middle English with essentially the same meaning it holds today.