Did you know?

Click any word in a definition or example to find the entry for that word

mouth - definition and synonyms

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

verb [transitive]     mouth pronunciation in American English
Word Forms
present tense
present participlemouthing
past tensemouthed
past participlemouthed
  1. 1
    to form words with your mouth but not make any sound

    She mouthed something I couldn’t make out.

  2. 2
    to say something without really meaning or understanding what you say
    mouth platitudes (=comments that are not original):

    You listen to the same people mouthing platitudes about our educational system being the best in the world.

phrasal verbs



to manipulate someone psychologically so that they begin to question their own perceptions and memories

BuzzWord Article

Open Dictionary

Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play