What Does It Mean When Someone Is on a Mission

: undertaking a task that one considers to be a very important duty She’s on a mission to locate her lost sister.

What does it mean to go on mission?

Meaning: Being on a mission refers to acting in a determined way and so focus in doing something that he/she is oblivious of anything else around him/her.

What does it mean to have mission?

If you say that you have a mission, you mean that you have a strong commitment and sense of duty to do or achieve something. He viewed his mission in life as protecting the weak from the evil. There is an enormous sense of mission in his speech and gesture.