student asking question

What does “act up” mean?

teacher

Native speaker’s answer

Rebecca

"Act up" means to not function in a proper way. In this video, the conductor's elbow has a problem so he could not conduct the orchestra properly. Here are some examples of "act up" Ex: Since I sprained my ankle, it keeps acting up that I can't even walk properly. Ex: The weather was too hot that the air conditioner started acting up.

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