Verb countervail has 2 senses
  1. offset, countervail - compensate for or counterbalance; "offset deposits and withdrawals"
    --1 is one way to balance, equilibrate, equilibrize, equilibrise
    Sample sentence:
    Something ----s something
  2. counteract, countervail, neutralize, counterbalance - oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues"
    --2 is one way to cancel, offset, set off
    Sample sentence:
    Somebody ----s something
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