Definition of counteract

verb (v)

• act in opposition to (verb.social)

  Synonym: antagonise, antagonize
  

  source: wordnet30
• oppose or check by a counteraction (verb.social)

  Synonym: countercheck
  

  source: wordnet30
• oppose and mitigate the effects of by contrary actions (verb.social)

  Synonym: counterbalance, countervail, neutralize
  

  Example:
  This will counteract the foolish actions of my colleagues.
  

  source: wordnet30
• destroy property or hinder normal operations (verb.social)

  Synonym: countermine, sabotage, subvert, undermine, weaken
  

  source: wordnet30
• To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice. (verb)

  source: webster1913

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