Etymology
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countervail (v.)

late 14c., countrevaillen, "to be worth as much as," also "to prevail against, resist with equal force," from Anglo-French countrevaloir, Old French contrevaloir "to be effective against, be comparable to," from Latin phrase contra valere "to be worth against" (see contra- and valiant). Related: Countervailing.

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Definitions of countervail

countervail (v.)
compensate for or counterbalance;
Synonyms: offset
countervail (v.)
oppose and mitigate the effects of by contrary actions;
From wordnet.princeton.edu