actact2 ●●● S2 W1 verb 1 do something [intransitive]DO something/TAKE ACTION to do something in a particular way or for a particular reason The company acted correctly in sacking him. The jury decided that Walker had acted in self-defence.act to do something The UN must act now to restore democracy. Politicians will only act when enough people demand that they do something.RegisterIn everyday English, people often use expressions like do the right thing or do a brave thing rather than use act with an adverb such as correctly or bravely: They acted correctly in telling her. → They did the right thing in telling her.When act is used alone to mean ‘take action’, in everyday English people usually just say do something:We have to do something now.2 behave [intransitive always + adverb/preposition] to behave in a particular way They acted unreasonably when they turned down Jill’s application. He’s been acting strangely ever since his mom died.act as if Pip acted as if he was better than everyone else.act like Stop acting like a baby.act with She acted with dignity.act your age (=used to tell someone to behave in a more adult way, suitable for someone of their age)3 pretend [intransitive, transitive] to pretend to have feelings, qualities etc that are different from your true ones When he’s angry, he acts the fool. That guy is acting crazy.act a part/role Stella felt unnatural in their company, as if she was acting a part.act as if/like Why does he act as if he was stupid?► see thesaurus at pretend4 play/filmAPACTOR/ACTRESS [intransitive, transitive] to perform in a play or film I first started acting when I was 12 years old.act a part/role She is acting the role of Lady Macbeth six evenings a week. The movie is very well acted.5 have an effect [intransitive]DO to have an effect or useact as The padding acts as a cushion if the player falls or is hit by the ball.act on Disinfectants act on bacteria in two main ways.6 → act for somebody/act on somebody’s behalf → act as something → act on/upon something → act something ↔ out → act up→ See Verb table
Examples from the Corpusact• a fast-acting decongestant• That woman just can't act!• The picture has a good script and is wonderfully acted.• But it seemed to me that most of us were just acting.• But there are many other ways in which we could act.• Despite the crisis, the Commission seems unwilling to act.• It takes a couple of minutes for the drug to act.• As often as not, the government would then act against the loyalists to prevent the increase in tension.• Bernard in the twelfth century: The river enters the abbey as much as the well acting as a check allows.• It will no longer act as a spring but at least it will give the cabin a more solid base.• Morgan Stanley will act as co-global coordinator.• She acts as if she owns the place and we're her servants.• Even in towns women did not normally act as traders.• We must act before the situation gets out of control.• Morganstern claims he was acting in self-defense.• In recent years Lewis has been acting in television dramas.• It is not the world we seem to experience and act in.• He has been accused of acting like a dictator.• I acted more out of compassion than anything else.• The report says the officers acted professionally and responsibly.• Larry was acting really weird.• Congress must act soon on this vital legislation.• You're acting stupid and I don't want to talk to you anymore.• Critics accuse the company of acting too slowly in notifying residents of the chemical leak.• Tina's been acting very strangely lately.• He learned to act when he was in highschool.act to do something• Property rights thus have a distributional implication - who compensates whom - but also act to achieve the socially efficient allocation.• Meanwhile, government ministers faced calls for their resignation, and Yeltsin acted to ban the more blatant manifestations of opposition activity.• It wasn't like him, it was out of character, but she wasn't acting to character either.• Congress recently acted to deny trade preferences to countries that fail to meet their legal obligations to end such abusive child labor.• The systematic activation of prior knowledge can act to prepare for and deepen the likely response to a text.• The statute requires, however, not a threat of immediate danger, but rather an immediate need to act to protect.• President Clinton has said he will act to stop the war spreading to Kosovo, but few in Kosovo believe his promises.• Crowe brings much more than acting to the role.act as if• A boxing instructor may teach his pupil to strike him in a given way by acting as if hurt.• I was not ready to act as if I were dead already.• And I could act as if running a new household was an ambition f could concentrate on and fall in love with.• She acted as if she were an enfranchised male.• He does not, but his genes act as if they do.• They acted as if they knew what would happen if they lost, and they were scared to death of it.• When practice starts up again after the weekend, Jody acts as if Vanderbilt never happened.act a part/role• Available for singing, dancing, acting roles.• Hannah Benn knew that she would have to spend her evening acting a part.• These were his friends but he felt unnatural in their company, as if he were acting a part.• She couldn't be completely spurious; no-one could act a part like that.act a part/role• Available for singing, dancing, acting roles.• Hannah Benn knew that she would have to spend her evening acting a part.• These were his friends but he felt unnatural in their company, as if he were acting a part.• She couldn't be completely spurious; no-one could act a part like that.act as• The sugar in the fruit acts as a preservative.