| Verb | 1. | double up - bend over or curl up, usually with laughter or pain; "He doubled and vomited violently"bend, flex - form a curve; "The stick does not bend" | |
| 2. | double up - share a room or a bed designed for only one personshare - use jointly or in common | |
| 3. | double up - stake winnings from one bet on a subsequent wager | |