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English definition of “counteract”

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counteract

verb [T] uk   /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.
(Definition of counteract from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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