- antagonize: act in opposition to
- countercheck: oppose or check by a counteraction
- oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues"
- sabotage: destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war"
- (counteraction) neutralization: action intended to nullify the effects of some previous action
- To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice
- To oppose the effects of something.