double up phrasal verb (see also double)

1. (also double over) to suddenly bend over at the waist because you are laughing so much or are in pain:
Emilio doubled over, grabbing his leg.
be doubled up/over with laughter/pain etc
Both the girls were doubled up with laughter.

2. to share something, especially a bedroom
double up with
You’ll have to double up with Susie while your aunt is here.

[TahlilGaran] Dictionary of Contemporary English ▲

double up
double up (with (someone))
to share a room or or living situation with others.
The two boys will have to double up in the front bedroom.

[TahlilGaran] English Idioms Dictionary ▲

double up
to share a room with someone
The passengers had to double up in hotel rooms when the plane landed because of the weather.

[TahlilGaran] English Idioms Dictionary ▲

double up
v.
1. To bend far over forward.
Jim was hit by the baseball and doubled up with pain.
2. To share a room, bed, or home with another.
When relatives came for a visit, Ann had to double up with her sister.

[TahlilGaran] English Idioms Dictionary ▲