Did you know?

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

cloud - 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     cloud pronunciation in British English
Word Forms
present tense
present participleclouding
past tenseclouded
past participleclouded
  1. 1



    cloud over

    [intransitive] to become darker because grey clouds are forming in the sky
  2. 2
    [intransitive/transitive] if something transparent or shiny clouds, or if something clouds it, it becomes difficult to see through or into it
    1. a.
      if something clouds a clear liquid, or if it clouds, it becomes no longer clear

      The solution clouds if you shake it.

  3. 3
    [transitive] to affect your thinking in a way that makes you likely to make a bad decision or forget something
    cloud someone’s judgment:

    Make sure that personal motivation is not clouding your judgment.

  4. 4
    [transitive] to make something more complicated or confusing
    cloud the issue:

    Unanswered questions have further clouded the issue.

  5. 6
    [intransitive/transitive] if an emotion clouds your eyes, your eyes show the emotion

phrasal verbs

quiz invitation
  • Facebook
  • Twitter

Open Dictionary

patio diplomacy

high-level diplomats meeting and dining in an informal environment e.g. a party or club

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