Did you know?

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

undermine - 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] undermine pronunciation in British English /ˌʌndə(r)ˈmaɪn/
Word Forms
present tense
present participleundermining
past tenseundermined
past participleundermined
  • Facebook
  • Twitter
  1. 1
    to make something or someone become gradually less effective, confident, or successful
    Business confidence was undermined by a series of major failures.
    Their trading position has been seriously undermined by the minister’s remarks.
    Britain was accused of undermining international efforts to reduce pollution.
    1. a.
      to deliberately say or do things that make someone appear less impressive or less important
      They had spoken secretly to journalists in an effort to undermine the leadership.


a meal served in the evening which consists of foods traditionally eaten at breakfast

BuzzWord Article

Open Dictionary

troll factory

a company that pays its employees to write online comments in favour or against somebody or something posing as ordinary Internet users

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