double up

Từ điển Oxford Advanced Learner 8th

▪ I. ˌdouble ˈup/ˈover | ˌdouble sb ˈup/ˈover derived
to bend or to make your body bend over quickly, for example because you are in pain
•Jo doubled up with laughter.
•I was doubled over with pain.
Main entry: ↑double_derived
 
▪ II. ˌdouble ˈup (on sth/with sb) derived
(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.
Main entry: ↑double_derived