Pronunciation: /ˈæk.tɪd ʌp/
verb to behave in a disruptive or unruly manner
A1 The child acted up in class and disrupted the lesson.
A2 My computer always acts up when I try to stream videos.
B1 The old car started acting up on the highway, so we had to pull over.
B2 The actor's behavior on set began to act up, causing delays in filming.
C1 The athlete's knee injury acted up during the championship game.
C2 The political situation in the country is acting up, causing concern among the citizens.
formal The computer system acted up during the presentation, causing a delay.
informal My car always seems to act up when I'm in a hurry.
slang His phone acted up and he missed the important call.
figurative The storm acted up, causing chaos and destruction in its path.
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