counteract

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English[edit]

Etymology[edit]

From counter- +‎ act.

Pronunciation[edit]

Verb[edit]

counteract (third-person singular simple present counteracts, present participle counteracting, simple past and past participle counteracted)

  1. To act in opposition to; thwart; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

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