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Verb: double up
  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: doubling up, doubles up, doubled up

See also: double

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