counteract

v 1: act in opposition to [syn: {antagonize}, {antagonise}]

2: oppose or check by a counteraction [syn: {countercheck}]

3: oppose and mitigate the effects of by contrary actions;

"This will counteract the foolish actions of my

colleagues" [syn: {countervail}, {neutralize}, {counterbalance}]

4: destroy property or hinder normal operations; "The

Resistance sabotaged railroad operations during the war"

[syn: {sabotage}, {undermine}, {countermine}, {subvert}, {weaken}]