by being told about sth by sb else who has seen it or heard about it, not by experiencing, seeing, etc. it yourself :
I'm fed up of hearing about these decisions third hand!
by being told about sth by sb else who has seen it or heard about it, not by experiencing, seeing, etc. it yourself :
I'm fed up of hearing about these decisions third hand!
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005