Meaning of the word "mean business" in English

What does "mean business" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

mean business

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

Idiom

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

Example:
When the boss walked in with that look on his face, we knew he meant business.
The new security measures show that the company means business about protecting its data.