( informal ) to form a pair in order to do sth or to share sth :
We'll have to double up on books; there aren't enough to go around.
They only have one room left: you'll have to double up with Peter.
( informal ) to form a pair in order to do sth or to share sth :
We'll have to double up on books; there aren't enough to go around.
They only have one room left: you'll have to double up with Peter.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005