1. Misbehave badly; act in a silly or improper way
   "The children acted up when they were not bored"
   - carry on 
2. Make itself felt as a recurring pain
   "My arthritis is acting up again"

Derived forms: acted up, acts up, acting up

See also: act

Type of: ache, hurt, misbehave, misconduct, misdemean, smart

Encyclopedia: Act up

• protectorship
• Proteidae
• protein
• protein folding
• protein molecule
• proteinaceous
• proteinase
• proteinuria
• Proteles
• Proteles cristata
• proteolysis
• proteolytic
• proteolytic enzyme
• proteome
• proteomics
• proteose
• proteosome
• proteosome vaccine
• Proterochampsa
• proterozoic
• Proterozoic aeon
• Proterozoic eon
• protest
• protest march
• protestant