COUNTERACT

counteract. Counteract, v.t. to act contrary to, hinder, stop

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Coun′ter‐act″ (koun′t?r–?kt″), v. t. [imp. & p. p. Counteracted; p. pr. & vb. n. Counteracting.] To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.