Counteract

v. t.

1.

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. [imp. & p. p. Counteracted; p. pr. & vb. n. Counteracting.]

Verb	1.	counteract - act in opposition to Synonyms: antagonise, antagonize
	2.	counteract - oppose or check by a counteraction Synonyms: countercheck
	3.	counteract - oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues" Synonyms: countervail, neutralize, counterbalance
	4.	counteract - destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war" Synonyms: countermine, sabotage, undermine, weaken, subvert

annul, antagonize, baffle, balance, balk, be antipathetic, be at cross-purposes, be inimical, be opposed to, beat against, blast, brave, bump heads, cancel, cancel out, challenge, checkmate, circumvent, clash, collide, conflict, conflict with, confound, confront, confute, contend, contradict, contrapose, contraposit, contrast, contrast with, contravene, controvert, correct, counter, counterattack, countercheck, countermand, counterpoise, counterpose, countervail, counterweigh, counterwork, cross, dash, defeat, defy, destroy, discomfit, disconcert, discountenance, dish, disrupt, elude, equiponderate, face, fix, flummox, foil, front, frustrate, go against, go counter to, interfere with, join the opposition, juxtapose in opposition, knock the chocks, lie opposite, lock horns, match, meet head-on, militate against, mitigate, negate, negative, nonplus, not abide, nullify, oppose, oppugn, perplex, play at cross-purposes, polarize, pose against, protest, put in opposition, rectify, redress, resist, right, ruin, run against, run counter to, sabotage, scotch, set off, set over against, spike, spoil, square, square up, stand opposed, stand opposite, stonewall, stump, subtend, swim upstream, take issue with, traverse, upset, vote against, withstand, work against

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