to mean business
01
진심이다, 장난이 아니다
to be very serious about fulfilling one's intentions
![to [mean] business definition and meaning](https://cdn.langeek.co/photo/42928/original/?type=jpeg "to [mean] business definition and meaning")
예시들
After months of preparation, the team finally stepped onto the field and meant business in their championship match.
경고장이 도착한 뒤 우리는 집주인이 장난이 아니라는 걸 깨달았다.
