- 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.
Meaning of 'counteract' (Princeton's WordNet)
1 . counteract
[ v]
Meaning (1): - destroy property or hinder normal operations
Example in sentence:
The Resistance sabotaged railroad operations during the war
Meaning (2): - oppose and mitigate the effects of by contrary actions
Example in sentence:
This will counteract the foolish actions of my colleagues