to hesitate because you are nervous about doing or saying sth :
I was sure she knew the answer but for some reason she hung back.
to hesitate because you are nervous about doing or saying sth :
I was sure she knew the answer but for some reason she hung back.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005