From Longman Dictionary of Contemporary Englishdouble up phrasal verb1 (also double over)BEND 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 SHAREto share something, especially a bedroom with You’ll have to double up with Susie while your aunt is here. → double→ See Verb table
Examples from the Corpus
double with• Then there are the guys who double up with a chick.• Many can't afford their own homes and double up with family.• All the grooms doubled up with laughter. 