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English definition of “counteract”

counteract

verb [T]     /ˌkaʊn.tərˈækt/ US  /-t̬ɚ.ækt/
to reduce or remove the effect of something unwanted by producing an opposite effect : Drinking a lot of water counteracts the dehydrating effects of hot weather .Reacting and responding
(Definition of counteract verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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