We found 4 definitions of act up from 3 different sources.
Verb |
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act up - make itself felt as a recurring pain; "My arthritis is acting up again" | ||
smart, ache, hurt have a desire for something or someone who is not present; "She ached for a cigarette"; "I am pining for my lover" | ||
act up - misbehave badly; act in a silly or improper way; "The children acted up when they were not bored" | ||
carry on | ||
misbehave, misdemean, misconduct behave badly; "The children misbehaved all morning" |