Pronunciation: /ˈæk.tɪŋ ʌp/
verb to behave or function in a disruptive or unruly manner
A1 My computer is acting up and I can't open any programs.
A2 The car started acting up on the highway, so we had to pull over.
B1 The child's behavior in class has been acting up lately, causing disruptions.
B2 The old printer has been acting up again, so I might need to get it repaired.
C1 The politician's past scandals are acting up and affecting his current campaign.
C2 The CEO's health issues are acting up, leading to concerns about the company's future.
formal The computer system is acting up and causing delays in the project.
informal My phone keeps acting up and freezing on me.
slang I think my car is acting up again, it keeps making weird noises.
figurative Her emotions were acting up, causing her to lash out unexpectedly.
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more acting up
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to act up
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acting up