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.

 

© Webster 1913.

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