Synonyms of double up

Verb

1. double over, double, double up, bend, flex

usage: bend over or curl up, usually with laughter or pain; "He doubled and vomited violently"

2. double up, share

usage: share a room or a bed designed for only one person

3. parlay, double up, bet on, back, gage, stake, game, punt

usage: stake winnings from one bet on a subsequent wager