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Meaning of “act up” in the English Dictionary

"act up" in British English

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(Definition of act up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"act up" in American English

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act up

phrasal verb with act  us   /ækt/ verb
  • (BEHAVE BADLY)

to behave badly: The little girl was acting up, so her mother took her out of the restaurant.

act up

phrasal verb with act  us   /ækt/ verb
  • (OPERATE BADLY)

to operate badly: My car is acting up again - I don't know what's wrong with it.

act up

phrasal verb with act  us   /ækt/ verb
  • (BECOME ACTIVE)

to become active: Her allergies acted up when she went hiking in the woods.
(Definition of act up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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“act up” in American English

    A bunch of stuff about plurals
    A bunch of stuff about plurals
    by ,
    May 24, 2016
    by Colin McIntosh One of the many ways in which English differs from other languages is its use of uncountable nouns to talk about collections of objects: as well as never being used in the plural, they’re never used with a or an. Examples are furniture (plural in German and many other languages), cutlery (plural in Italian), and

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