American English

Definition of counteract verb from the Oxford Advanced American Dictionary



    counteract somethingVerb Forms present simple I / you / we / they counteract
    he / she / it counteracts
    past simple counteracted
    -ing form counteracting
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  1. 1to do something to reduce or prevent the bad or harmful effects of something synonym counter
  2. 2 These exercises aim to counteract the effects of stress and tension.
See the Oxford Advanced Learner's Dictionary entry: counteract