To be make equal, offset, compensate.
Then Esther the queen answered and said, If I have found favour in thy sight, O king, and if it please the king, let my life be given me at my petition, and my people at my request: For we are sold, I and my people, to be destroyed, to be slain, and to perish. But if we had been sold for bondmen and bondwomen, I had held my tongue, although the enemy could not COUNTERVAIL the king's damage. ( Esther 7:3-4 )
Bibliography Information"Entry for 'Countervail'". A King James Dictionary.