"counteract" in the verb sense
1. antagonize, antagonise, counteract
act in opposition to
2. countercheck, counteract
oppose or check by a counteraction
3. counteract, countervail, neutralize, counterbalance
oppose and mitigate the effects of by contrary actions
"This will counteract the foolish actions of my colleagues"
4. sabotage, undermine, countermine, counteract, subvert, weaken
destroy property or hinder normal operations
"The Resistance sabotaged railroad operations during the war"
Source: WordNet® (An amazing lexical database of English)
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