to take a risk with sth, hoping that you will be successful :
He gambled on being able to buy a ticket at the last minute.
to take a risk with sth, hoping that you will be successful :
He gambled on being able to buy a ticket at the last minute.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005