to try as hard as you can (to do sth) :
She did her damnedest to get it done on time.
to try as hard as you can (to do sth) :
She did her damnedest to get it done on time.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005