a) (also double over)BEND to suddenly bend over at the waist because you are laughing so much or are in pain 〔笑或痛得〕弯下腰
Emilio doubled over, grabbing his leg.
埃米利奥弓起身子,抱住自己的腿。
be doubled up/over with laughter/pain etc
Both the girls were doubled up with laughter.
两个女孩都笑得直不起身。
b)SHAREto share something, especially a bedroom 共用〔尤指卧室〕
with
You’ll have to double up with Susie while your aunt is here.
姨妈来的时候你得和苏茜同住一间房。
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 groomsdoubled up withlaughter.