The term countervail is from the 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."

Countervailing Duties (CVDs) are tariffs levied on imported goods to offset subsidies made to producers of these goods in the exporting country. CVDs are a regulation meant to neutralize the negative effects that subsidies of the production of a good in one country have on that same industry in another country and are meant to level the playing field between domestic producers of a product and foreign producers of the same product. The WTO only permits countervailing duties to be charged after the importing nation has conducted an in-depth investigation into the subsidized exports.

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Prevail with the self, comparable in the game, worthy proponent