take it upon (yourself/itself) to (do something)

to accept a responsibility without being asked to.

He took it upon himself to personally thank each person who came to the memorial service.

The Transit Authority has taken it upon itself to be the spokesman for its riders.

Is there a reason why some countries should take upon themselves the role of international policeman?

• see the light
• see the light of day
• see the sights
• see the writing on the wall
• see things
• see through
• see through someone
• see through something
• see to
• see to something
• see true colours
• see what is made of
• see what someone is made of
• see which way the cat jumps
• see which way the wind is blowing
• see your name in lights
• see your way clear to
• see your way clear to doing something
• see your way to
• see your way to doing something
• seize the day
• seize up
• self-made man
• sell a bill of goods
• sell down the river