Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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act up

act up

 
See:
act
features:
Word Explorer
part of speech: phrase
definition 1: to behave in a bad or mischievous way; misbehave.
synonyms:
carry on, fool around, misbehave
similar words:
goof off, rebel, transgress
definition 2: to malfunction.
synonyms:
break down, malfunction
similar words:
break
definition 3: to happen again or return, as an illness or malfunction.
My allergies are acting up.
synonyms:
recur, return
Word Explorer
See
  behavior, disease