Meaning

2 senses
  1. (idiomatic, intransitive)To misbehave; to cause trouble.

    My allergies act up during hay fever season.

    Children may act up in class in an effort to get attention.

  2. (idiomatic, intransitive)To perform the duties of an appointment senior to that actually held; to deputise for a superior.

    Acting up is always recommended when you find yourself under a new boss.

More definitions
  • make itself felt as a recurring pain
  • misbehave badly; act in a silly or improper way

Examples

9 sentences
  1. Children want to act like grown-ups.

    Діти хочуть поводитися, як дорослі. — deniko

    ruДети хотят подражать взрослым. — marafon

    deKinder wollen sich wie Erwachsene benehmen. — al_ex_an_der

  2. You should act like grown-ups.

  3. Tom acts more grown-up than Mary.

  4. Tom acts more grown-up than Mary does.

  5. I acted up to my principles.

    ruЯ поступил согласно своим принципам. — marafon

Translations

3 languages

Forms

acts up, acting up, acted up, acted up
Base formact up · to act up
3rd person singularacts up
Present participleacting up
Past simpleacted up
Past participleacted up

irregular

Present simpleLesson

I, you, we, theyact up
he, she, itacts up

Past simpleLesson

all personsacted up

Present perfectLesson

I, you, we, theyhave acted up
he, she, ithas acted up

Future simple (will)Lesson

all personswill act up

Phrasal verbs

3 phrasal verbs

Synonyms

3 synonyms
Close in meaning
  • misbehave badly; act in a silly or improper way:carry on

See also

neighbours in the dictionary
act up — meaning, examples, forms, synonyms | Krumeto