Did you know?

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

boost - 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.



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] boost pronunciation in British English /buːst/
Word Forms
present tense
present participleboosting
past tenseboosted
past participleboosted
  • Facebook
  • Twitter
  1. 1
    to help something to increase, improve, or become more successful
    Their share price climbed again today, boosted by rising sales.
    a drug that boosts serotonin levels in the body
    an attempt to boost the minister’s popularity
  2. 2
    to make someone feel more positive or more confident
    boost morale/confidence: The change of management has boosted morale throughout the company.


a fashion trend in which people intentionally wear ordinary, inexpensive, widely-available clothing

BuzzWord Article

Open Dictionary


a flower or small bunch of flowers worn on the lapel of a jacket on special occasions

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