Definition
This idiom is used to describe situations where people misbehave or act freely when the person in charge is absent.
指負責的人不在時，其他人會開始胡作非為。
When the teacher left the classroom, the students started to make a lot of noise; it was truly 'while the cat's away, the mice will play.'
當老師離開教室時，學生們開始大聲喧嘩；這真是『貓不在，老鼠就鬧翻天』。
After the manager went on a business trip, the office atmosphere became very relaxed, and everyone was chatting; it's 'while the cat's away, the mice will play'.
經理出差後，辦公室的氣氛變得非常輕鬆，大家都在聊天；這就是『貓不在，老鼠就鬧翻天』。
After the parents went on vacation, the kids immediately started staying up late playing games; it's definitely 'while the cat's away, the mice will play'.
父母去度假後，孩子們立即開始熬夜玩遊戲；這絕對是『貓不在，老鼠就鬧翻天』。