1.
to fall so that you are lying on your front
2.
to fail completely, usually causing embarrassment :
His next television venture fell flat on its face.
1.
to fall so that you are lying on your front
2.
to fail completely, usually causing embarrassment :
His next television venture fell flat on its face.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005