transitive verb Date: 1655 to make ineffective or restrain or neutralize the usually ill effects of by means of an opposite force, action, or influence <
a drug used to counteract fatigue
counteraction nouncounteractive adjective

New Collegiate Dictionary. 2001.

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  • Counteract — 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… …   The Collaborative International Dictionary of English

  • counteract — UK US /ˌkaʊntərˈækt/ verb [T] ► to take action to reduce the influence of something that may be harmful: »Spending on marketing and advertising has increased in order to counteract falling sales. »These new energy technologies are aimed at… …   Financial and business terms

  • counteract — I verb act in opposition to, agitate against, annul, antagonize, be at cross purposes, be contrary, bid against, cancel out, clash, collide, come in conflict with, conflict with, confute, contend, contradict, counter, counterbalance, countermand …   Law dictionary

  • counteract — 1670s, from COUNTER (Cf. counter ) + ACT (Cf. act). Related: Counteracted; counteracting …   Etymology dictionary

  • counteract — *neutralize, negative Analogous words: *correct, rectify: offset, counterbalance, countervail, counterpoise, balance, *compensate Antonyms: cooperate Contrasted words: conjoin, concur, *unite, combine …   New Dictionary of Synonyms

  • counteract — [v] do opposing action annul, buck, cancel, cancel out, check, contravene, correct, counterbalance, countercheck, countervail, counterwork, cross, defeat, fix, foil, frustrate, go against, halt, hinder, invalidate, negate, negative, neutralize,… …   New thesaurus

  • counteract — ► VERB ▪ act against (something) so as to reduce its force or neutralize it. DERIVATIVES counteraction noun counteractive adjective …   English terms dictionary

  • counteract — [kount΄ər akt′] vt. to act directly against; check, neutralize, or undo the effect of with opposing action counteraction n. counteractive adj., n …   English World dictionary

  • counteract — UK [ˌkaʊntərˈækt] / US verb [transitive] Word forms counteract : present tense I/you/we/they counteract he/she/it counteracts present participle counteracting past tense counteracted past participle counteracted to reduce the negative effect of… …   English dictionary

  • counteract — [[t]ka͟ʊntərækt[/t]] counteracts, counteracting, counteracted VERB To counteract something means to reduce its effect by doing something that produces an opposite effect. [V n] My husband has to take several pills to counteract high blood… …   English dictionary

  • counteract — verb 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 …   Wiktionary

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