koun-ter-val' (shawah, "equalize"):

To thwart or overcome by acting against with equal force; thus, "The enemy could not countervail the king's damage" or loss (Esther 7:4 the American Standard Revised Version reads "The adversary could not have compensated for the king's damage"). "Nothing doth countervail (the Revised Version (British and American) "can be taken in exchange for") a faithful friend" (Ecclesiasticus 6:15).

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'COUNTERVAIL'". "International Standard Bible Encyclopedia". 1915.