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counteract

[ koun-ter-akt ]
/ ˌkaʊn tərˈækt /
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See synonyms for: counteract / counteracting on Thesaurus.com

verb (used with object)
to act in opposition to; frustrate by contrary action.
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Origin of counteract

First recorded in 1670–80; counter- + act

OTHER WORDS FROM counteract

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use counteract in a sentence

British Dictionary definitions for counteract

counteract
/ (ˌkaʊntərˈækt) /

verb
(tr) to oppose, neutralize, or mitigate the effects of by contrary action; check

Derived forms of counteract

counteraction, nouncounteractive, adjectivecounteractively, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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