The meaning of COUNTERACT is to make ineffective or restrain or neutralize the usually ill effects of by means of an opposite force, action, or influence. How to use counteract in a sentence.

COUNTERACT definition: 1. to reduce or remove the effect of something unwanted by producing an opposite effect: 2. to…. Learn more.

COUNTERACT definition: to act in opposition to; frustrate by contrary action. See examples of counteract used in a sentence.

To counteract something means to reduce its effect by doing something that produces an opposite effect. My husband has to take several pills to counteract high blood pressure. [VERB noun] This …

counteract (ˌkaʊntərˈækt) vb (tr) to oppose, neutralize, or mitigate the effects of by contrary action; check ˌcounterˈaction n

Definition of counteract verb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Jan 18, 2026 · counteract (third-person singular simple present counteracts, present participle counteracting, simple past and past participle counteracted) (transitive) To have a contrary or …

Definition of counteract. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels.

To counteract is to work against something in an attempt to reverse it or cancel it out. You can try to counteract the neighbors' annoyance at your loud music by bringing them some homemade brownies.

Counteract definition: To oppose and mitigate the effects of by contrary action; check.