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1. Twice as great or many
   "the dose is doubled"
   - double, twofold, two-fold

1. Increase twofold
   "The population doubled within 50 years"
   - duplicate
    
2. Hit a two-base hit
    
3. Bend over or curl up, usually with laughter or pain
   "He doubled and vomited violently"
   - double over, double up
    
4. Do double duty; serve two purposes or have two functions
   "She doubles as his wife and secretary"
    
5. Bridge: make a demand for (a card or suit)
    
6. Make or do or perform again
   - duplicate, reduplicate, repeat, replicate

See also: double up, doubling, multiple

Type of: bend, bid, call, flex, function, go, hit, manifold, multiply, operate, reproduce, run, work

Encyclopedia: Double, Double Double Double, Double, Boy in Trouble Double, Triple, and Quadruple Eagles Double, Double, Toil and Trouble