take it upon yourself to do

to accept responsibility for something without being asked to:
پذیرش مسئولیت چیزی بدون اینکه از شما خواسته شود
( بر خود فرض دانستن/ خود را موظف دانستن )
مثال:
He took it upon himself to personally thank each person at the meeting.
... [مشاهده متن کامل]