mean business

US /miːn ˈbɪz.nɪs/
UK /miːn ˈbɪz.nɪs/
"mean business" picture
1.

진심이다, 진지하다

to be serious and determined about what one is doing or saying

:
When the boss walked in with that look on his face, we knew he meant business.
상사가 그런 표정으로 들어왔을 때, 우리는 그가 진심이라는 것을 알았다.
The new security measures show that the company means business about protecting its data.
새로운 보안 조치들은 회사가 데이터 보호에 진심이라는 것을 보여준다.