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Verb: counteract  ,kawn-tu(r)'akt
  1. Act in opposition to
    - antagonize, antagonise [Brit]
  2. Oppose or check by a counteraction
    - countercheck
  3. Oppose and mitigate the effects of by contrary actions
    "This will counteract the foolish actions of my colleagues";
    - countervail, neutralize, counterbalance, neutralise [Brit]
  4. Destroy property or hinder normal operations
    "The Resistance counteracted railway operations during the war";
    - sabotage, undermine, countermine, subvert, weaken

Derived forms: counteracted, counteracting, counteracts

Type of: act, cancel, check, contain, control, curb, disobey, hold, hold in, mod [informal], moderate, move, offset, set off