Question

take it upon yourself My colleague took it upon himself to rearrange the office.

Accepted Answer

If you take something upon yourself, you do it without asking for permission or agreement.

Phrase/Idiom	take it upon yourself
Definition	If you take something upon yourself, you do it without asking for permission or agreement.
Example	My colleague took it upon himself to rearrange the office.

Permission Agreement Colleague Rearrange Office