countercheck, counteract -- (oppose or check by a counteraction)
counteract, countervail, neutralize, counterbalance -- (oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues")
sabotage, undermine, countermine, counteract, subvert, weaken -- (destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war")
(Sound)
