1. Increase twofold
   "The population doubled within 50 years";
   - duplicate
    
2. Do double duty; serve two purposes or have two functions
   "She doubles as his wife and secretary"
    
3. Make, do or perform again
   "The actor doubled his performance for the evening show";
   - duplicate, reduplicate, repeat, replicate
    
4. Bend over or curl up, usually with laughter or pain
   "He doubled and vomited violently";
   - double over, double up
    
5. (baseball) hit a two-base hit
   "The batter doubled to left field, driving in two runs"
    
6. (bridge) make a demand for (a card or suit)
   "She doubled her partner's bid to show strong support"

1. A base hit on which the batter stops safely at second base
   "he hit a double to deep centerfield";
   - two-base hit, two-bagger, two-baser
    
2. A quantity that is twice as great as another
   "36 is the double of 18"
    
3. Someone who closely resembles a famous person (especially an actor)
   "he could be Gingrich's double";
   - image, look-alike
    
4. A stand-in for movie stars to perform dangerous stunts
   "his first job in Hollywood was as a double for Clark Gable"
    
5. Raising the stakes in a card game by a factor of 2
   "I decided his double was a bluff";
   - doubling
    
6. A room (e.g. in a hotel) with a double bed
   "Do you have a double for tonight?";
   - double room

1. Twice as great or many
   "ate a double portion";
   - doubled, twofold, two-fold, bifold
    
2. Consisting of or involving two parts or components usually in pairs
   "an egg with a double yolk"; "a double (binary) star"; "double doors"; "duple (or double) time consists of two (or a multiple of two) beats to a measure";
   - dual, duple
    
3. Large enough for two
   "a double bed"; "a double room"
    
4. Having more than one decidedly dissimilar aspects or qualities
   "a double role for an actor"; "every episode has its double and treble meaning";
   - dual, twofold, two-fold, treble, threefold, three-fold, trifold
    
5. Having two meanings with intent to deceive
   "a sly double meaning";
   - forked
    
6. (botany) used of flowers having more than the usual number of petals in crowded or overlapping arrangements
   "double chrysanthemums have many rows of petals and are usually spherical or hemispherical"
    
7. (genetics) used of homologous chromosomes associated in pairs in synapsis
   "The double nature of chromosomes is crucial for genetic recombination";
   - bivalent

1. To double the degree
   "his eyes were double bright";
   - doubly, twice
    
2. Two together
   "some people sleep better double"
    
3. Downward and forward
   "he was bent double with pain"

Derived forms: doubled, doubles, doubling

See also: ambiguous, big, equivocal, large, multiple, parlay, valence, valency

Type of: actor, backup, base hit, bend, bid, call, doer, fill-in, flex, function, go, hit, manifold, multiple, multiply, operate, raise, relief, reliever, reproduce, run, safety, stand-in, substitute, work, worker

Antonym: single

Part of: card game, cards

Encyclopedia: Double, Double, Toil and Trouble