| adj. 1.  Twice as much in size, strength, number, or amount: a double dose. 2.  Composed of two like parts: double doors. 3.  Composed of two unlike parts; dual: a double meaning; a double role for an actor. 4.  Accommodating or designed for two: a double bed; a double room. 5.  Characterized by duplicity; deceitful: speak with a double tongue. 6.  Botany   Having many more than the usual number of petals, usually in a crowded or an overlapping arrangement: a double chrysanthemum. n. 1.  Something increased twofold. 2.  One that closely resembles another; a duplicate. 3.  a.  Something having two identifiable or prominent parts or members. b.  Something capable of carrying, moving, or holding two people or things, as a mattress. 4.  a.  An actor's understudy. b.  An actor who takes the place of another actor in scenes requiring special skills or preparations: a stunt double; a body double. 5.  An apparition; a wraith. 6.  a.  A sharp turn in a direction of movement; a reversal. b.  A sharp, often devious change in position or argument; a shift. 7.   doubles Sports   A form of a game, such as tennis or handball, having two players on each side. 8.  Baseball   A hit enabling the batter to reach second base. Also called  two-bagger,  two-base hit. 9.  Games   a.  A bid in bridge indicating strength to one's partner; a request for a bid. b.  A bid doubling one's opponent's bid in bridge, thus increasing the penalty for failure to fulfill the contract. c.  A hand justifying such a bid. v.  dou·bled, dou·bling, dou·bles  v.tr. 1.  To make twice as great. 2.  To be twice as much as: doubled the score of his opponent. 3.  To fold in two. 4.  To clench (one's fist). 5.  To duplicate; repeat. 6.  To turn (an enemy spy) into a double agent. 7.  Baseball   a.  To cause the scoring of (a run) by hitting a double. b.  To advance or score (a runner) by hitting a double. c.  To put out (a runner) as the second part of a double play. 8.  Games   To challenge (an opponent's bid) with a double in bridge. 9.  Music   To duplicate (another part or voice) an octave higher or lower or in unison. 10.  Nautical   To sail around: double a cape. v.intr. 1.  To be increased twofold: The debt soon doubled. 2.  To turn sharply or all the way around; reverse one's course: had to double back to touch the missed base. 3.  To serve in an additional capacity: a frying pan that doubles as a pie tin; a conductor who doubles as a pianist. 4.  To replace an actor in the actor's absence or in a certain scene. 5.  Baseball   To hit a double. 6.  Games   To announce a double in bridge. adv.Phrasal Verb: 1.  To twice the amount or extent; doubly: paid double for the customized car. 2.  Two together; in pairs: sleeping double. 3.  In two: bent double.  double upIdiom: 1.  To bend suddenly, as in pain or laughter. 2.  To share accommodations meant for one person.  on/at the double 1.  Immediately. 2.  In double time. [Middle English, from Old French, from Latin duplus; see  dwo- in the Appendix of Indo-European roots.] double·ness n. | 
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