used to say that you/sb would have been in the same position if you had done sth else, because you got little benefit or enjoyment from what you did do :
The weather was so bad we might just as well have stayed at home.
used to say that you/sb would have been in the same position if you had done sth else, because you got little benefit or enjoyment from what you did do :
The weather was so bad we might just as well have stayed at home.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005