Search Result for "counteract": 
Wordnet 3.0

VERB (4)

1. act in opposition to;
[syn: antagonize, antagonise, counteract]

2. oppose or check by a counteraction;
[syn: countercheck, counteract]

3. oppose and mitigate the effects of by contrary actions;
- Example: "This will counteract the foolish actions of my colleagues"
[syn: counteract, countervail, neutralize, counterbalance]

4. destroy property or hinder normal operations;
- Example: "The Resistance sabotaged railroad operations during the war"
[syn: sabotage, undermine, countermine, counteract, subvert, weaken]



The Collaborative International Dictionary of English v.0.48:

Counteract \Coun`ter*act"\ (koun`t?r-?kt"), v. t. [imp. & p. p.
   Counteracted; p. pr. & vb. n. Counteracting.]
   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.
   [1913 Webster]


WordNet (r) 3.0 (2006):

counteract
    v 1: act in opposition to [syn: antagonize, antagonise,
         counteract]
    2: oppose or check by a counteraction [syn: countercheck,
       counteract]
    3: oppose and mitigate the effects of by contrary actions; "This
       will counteract the foolish actions of my colleagues" [syn:
       counteract, countervail, neutralize, counterbalance]
    4: destroy property or hinder normal operations; "The Resistance
       sabotaged railroad operations during the war" [syn:
       sabotage, undermine, countermine, counteract,
       subvert, weaken]