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Verb: countervail  ,kawn-tu(r)'veyl
  1. Compensate for or counterbalance
    "countervail deposits and withdrawals";
    - offset
  2. Oppose and mitigate the effects of by contrary actions
    "This will countervail the foolish actions of my colleagues";
    - counteract, neutralize, counterbalance, neutralise [Brit]

Derived forms: countervailed, countervailing, countervails

Type of: balance, cancel, equilibrate, equilibrise [Brit], equilibrize, offset, set off