WordWeb Online

1. Bend over or curl up, usually with laughter or pain
   - double over, double
    
2. Share a room or a bed designed for only one person
    
3. Stake winnings from one bet on a subsequent wager
   - parlay

Derived forms: doubled up, doubling up, doubles up

See also: double

Type of: back, bend, bet on, flex, gage [archaic], game, punt, share, stake