Definition of 'counteract'

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Verb

1. act in opposition to
      Synonyms: antagonize antagonise
2. oppose or check by a counteraction
      Synonyms: countercheck
3. oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues"
      Synonyms: countervail neutralize counterbalance
4. destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war"
      Synonyms: sabotage undermine countermine subvert weaken

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