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to act up
[phrase form: act]
01
悪化する, 痛みが出る
to cause regular discomfort or pain, often related to a physical illness or health issue
02
ふざける, 乱れる
to behave in an improper manner, often disregarding rules or social norms
03
調子が悪くなる, 正常に動作しない
(of mechanical devices, technology, or equipment) to not work properly
04
一時的に役職を務める, 上位の役職を一時的に引き受ける
to be temporarily assigned to a higher position within an organization or role
act up
v
例
The arthritis in his hands acts up more during cold weather.
His old knee injury acts up every time it rains, causing him pain.
I can't play sports right now because my ankle is acting up again.
When her back starts acting up, she has trouble with daily activities.
Stress can make chronic conditions act up, so it's important to manage it.