Pronunciation: /æks ʌp/
verb A verb is a word that expresses an action or a state of being. In this case, 'acts up' is a verb phrase indicating misbehavior or malfunctioning.
A1 My computer acts up whenever I try to open multiple tabs.
A2 The car always acts up when it's cold outside.
B1 The printer acts up sometimes and refuses to print anything.
B2 Her phone acts up occasionally and freezes for no reason.
C1 The old TV acts up frequently and needs to be repaired.
C2 The software acts up from time to time, causing delays in the project.
formal The machine acts up whenever there is a power fluctuation.
informal My computer always acts up when I'm in a hurry.
slang My car acts up every time I try to show it off.
figurative His temper acts up whenever he is stressed out.
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