( NAmE , informal ) to express your approval of sth formally and definitely :
The President hasn't signed off on this report.
( NAmE , informal ) to express your approval of sth formally and definitely :
The President hasn't signed off on this report.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005