DictionaryAI

mouth

SayMOWTH/maʊθ/
As a verbMOWTH

Pluralmouths

Verbmouths, mouthing, mouthed

18 meanings of mouth

Practice

  1. 1
    body partnouncountable
    The opening in the face of a person or animal through which food is taken in and sounds come out, and the space behind it that holds the tongue and teeth.

    Don't talk with your mouth full.

    She opened her mouth to say something, then changed her mind.

    Note

    In anatomy it is the front end of the digestive tract, where many animals break food down with teeth before swallowing. The same word stretches to a river's outlet and to any opening at all.

    Checked 2 Nov 2026 · 2 facts

  2. 2
    river endnouncountable
    The end of a river where its water flows out into a sea, lake, or larger river.

    The ferry crosses the wide mouth of the estuary twice a day.

    Sediment builds up at the river's mouth, forming a broad delta.

    UsageMostly the mouth of the river or the river's mouth; places are often located at the mouth of a river.

    Similaroutlet

    Oppositesource

    Note

    Rivers and tributaries both have one, at the point where their water passes into something larger. John Ross, writing in The Scottish Geographical Magazine in 1895, puts the town of Antung at the mouth of the Yalu. The verb to empty at a mouth is built on this meaning.

    Checked 2 Nov 2026 · 5 facts

    • A river or tributary has its mouth where it flows into a larger body of water. en.wikipedia.org
    • John Ross wrote the cited article in The Scottish Geographical Magazine. archive.org
    • The cited magazine article was published in 1895. archive.org
    • Ross's passage places Antung at the mouth of the Yalu. archive.org
    • The verb mouth is derived from the noun. en.wiktionary.org
  3. 3
    speechnoun
    Speech or what a person says, especially their manner of speaking, as in word of mouth or a foul mouth.
    that in the mouth of two or three witnesses every word may be established
    1611, The Holy Bible, King James Version

    UsageSurvives in set phrases such as watch your mouth and shoot your mouth off.

    Note

    An older use treats spoken words as evidence, as in the King James Bible of 1611: "in the mouth of two or three witnesses every word may be established." The construction is in the mouth of, meaning roughly "on the word of."

    Checked 2 Nov 2026 · 3 facts

    • The King James Bible was first published in 1611. wwwe.lib.cam.ac.uk
    • The quotation appears verbatim in the King James Bible, at Matthew 18:16. en.wikisource.org
    • The biblical construction refers to establishing something through witnesses' spoken testimony. en.wikisource.org
  4. 4
    openingnouncountable
    An outlet, aperture, or other opening through which something passes.

    Smoke poured from the mouth of the chimney.

    He peered into the dark mouth of the tunnel.

    UsageMostly the mouth of + noun, the mouth of the cave, or second in a compound: tunnel mouth.

    Similaropening, entrance, aperture, outlet

    Note

    Any opening can have one, natural or built. Horace Walpole's The Castle of Otranto (1764) sets it at a cavern, Margery Allingham's The China Governess (1963) at the entrance to a London street, and Tim Dunn, writing in Rail in 2020, at a tunnel.

    Checked 2 Nov 2026 · 6 facts

    • Horace Walpole wrote The Castle of Otranto, first published in 1764. Its first-edition title page was dated 1765, but it appeared in December 1764. en.wikisource.org
    • The Castle of Otranto uses 'mouth' for a cavern's opening. gutenberg.org
    • Margery Allingham wrote The China Governess, first published in 1963. en.wikipedia.org
    • The China Governess uses 'mouth' for the entrance to a London street. en.wiktionary.org
    • Tim Dunn wrote an article in Rail in 2020. rchs.org.uk
    • Dunn's article uses the compound 'tunnel mouth'. en.wiktionary.org
  5. 5
    verbtransitive or intransitive
    To move the lips or shape words or air with the mouth, with or without sound.

    Some singers mouth the words along with a recording instead of singing live.

    Unable to shout over the loud music, he mouthed 'Let's go' and nodded toward the exit.

    Note

    The broadest of the verb's uses, and one that can stand without an object. Infants mouth, and Peter H. Wolff (1987) describes mouthing and tonguing movements that are hard to tell apart from smiling. With an object, it shapes air or words, as in James Hogg's "mere air mouthed into a sound." The result may or may not make a sound.

    Checked 31 Oct 2026 · 4 facts

Practice

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Origin

From Middle English mouth, from Old English mūþ, from Proto-Germanic *munþaz ("mouth"), probably from Proto-Indo-European *ment- ("to chew; jaw, mouth"), though the details are disputed. It is related to Dutch mond, German Mund, and Swedish mun, and to Latin mentum ("chin"). The verb comes from the noun.

Checked 1 Nov 2026 · 6 facts