used to say that one of two or more possibilities is true, but which one is true depends on the circumstances :
There may be an announcement about this tomorrow—or not, as the case may be.
used to say that one of two or more possibilities is true, but which one is true depends on the circumstances :
There may be an announcement about this tomorrow—or not, as the case may be.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005