mean business
成語所屬單字business
mean business — 慣用語
1. to be very serious about doing something, in a way that other people can clearly
1.慣用語
釋義
認真的；玩真的
to be very serious about doing something, in a way that other people can clearly see.
例句
The new coach arrived with a whistle and a clipboard, and the players knew she meant business.
When Dr. Tanaka raised his voice, the whole class realised he meant business.