double up
phrasal verbdouble up (on something/with somebody)
- (informal) to form a pair in order to do something or to share something
（两人）合用，共享 - We'll have to double up on books; there aren't enough to go around.
因为书不够人手一册，我们只好两人合用了。 - They only have one room left: you'll have to double up with Peter.
他们只剩下一个房间，你只好与彼得合住了。
- We'll have to double up on books; there aren't enough to go around.
double up/over | double somebody up/over
- to bend or to make your body bend over quickly, for example because you are in pain
（使）弯腰，弓身 - Jo doubled up with laughter.
乔笑弯了腰。 - I was doubled over with pain.
我痛得直不起身子。
- Jo doubled up with laughter.