1. [ verb ] bend over or curl up, usually with laughter or pain
Synonyms: double double_over

"He doubled and vomited violently"

Related terms: bend
2. [ verb ] share a room or a bed designed for only one person
Related terms: share
3. [ verb ] (games) stake winnings from one bet on a subsequent wager
Synonyms: parlay
Related terms: bet_on
Similar spelling:   double_play