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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
Example
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 ca n't play sports right now because my ankle is acting up again.
02
ふざける, 乱れる
to behave in an improper manner, often disregarding rules or social norms
Example
Children may act up when they are seeking attention from their parents.
During the class, some students tend to act up and disrupt the lesson.
The party became chaotic when a few guests started acting up after drinking.
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
Example
When the weather is very cold, my smartphone 's touchscreen can act up.
The car 's engine acted up, and it suddenly stopped on the highway.
My old computer tends to act up whenever I run multiple applications.
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
Example
The assistant coach will act up as the head coach during his absence.
Due to the manager 's illness, I had to act up as the team leader for a week.
While our supervisor is on maternity leave, John will act up as the interim department head.
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.
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