dou·ble (dŭb́əl)

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[Middle English, from Old French, from Latin duplus.]

adjective 

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.

noun 

1. Something increased twofold.
2. One that closely resembles another; a duplicate.
3. 1. An actor's understudy.
   2. An actor who takes the place of another actor in scenes requiring special skills or preparations: a stunt double; a body double.
4. An apparition; a wraith.
5. 1. A sharp turn in a direction of movement; a reversal.
   2. A sharp, often devious change in position or argument; a shift.
6. Sports A form of a game, such as tennis or handball, having two players on each side.
7. Baseball See two-base hit
8. Games
   1. A bid in bridge indicating strength to one's partner; a request for a bid.
   2. A bid doubling one's opponent's bid in bridge, thus increasing the penalty for failure to fulfill the contract.
   3. A hand justifying such a bid.

verb: -bled, -bling, -bles. 

transitive verb 

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
   1. To cause the scoring of (a run) by hitting a two-base hit.
   2. To advance or score (a runner) by hitting a two-base hit.
8. Baseball To put out (a runner) as the second part of a double play.
9. Games To challenge (an opponent's bid) with a double in bridge.
10. Music To duplicate (another part or voice) an octave higher or lower or in unison.
11. Nautical To sail around: double a cape.

intransitive verb 

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 two-base hit.
6. Games To announce a double in bridge.

adverb 

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.

phrasal verbs

double up

To bend suddenly, as in pain or laughter.

To share accommodations meant for one person.

idioms

on the double

Immediately. In double time.

derivatives

doúble·ness

noun

noun 

A hit enabling the batter to reach second base. Also called double, two-bagger