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Definition of counteract verb from the Oxford Advanced American Dictionary

 

counteract

 verb
verb
NAmE//ˌkaʊntəˈrækt//
 
counteract somethingVerb Forms present simple I / you / we / they counteract
 
he / she / it counteracts
 
past simple counteracted
 
-ing form counteracting
 
 
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to do something to reduce or prevent the bad or harmful effects of something synonym counter These exercises aim to counteract the effects of stress and tension.
See counteract in the Oxford Advanced Learner's Dictionary