這個拼法底下其實是2個不同的字，意思沒有關係， 只是長得一樣。下面分開列出來。跳到 act up (child behaves badly) · act up (machine or body gives trouble)
1
act up
A second word, same spelling
2
act up
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
act upverb/ækt ˈʌp/
- 1
To misbehave; to cause trouble.
- My allergies act up during hay fever season.
- Children may act up in class in an effort to get attention.
- 2
To perform the duties of an appointment senior to that actually held; to deputise for a superior.
- Acting up is always recommended when you find yourself under a new boss.
- A few months through my contract, my clinical supervisor said that a registrar was leaving the post early for a research job, and asked if I’d be interested in acting up on the rota.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。