"doubles" in the noun sense
1. double, two-base hit, two-bagger, two-baser
a base hit on which the batter stops safely at second base
"he hit a double to deep centerfield"
2. double, stunt man, stunt woman
a stand-in for movie stars to perform dangerous stunts
"his first job in Hollywood was as a double for Clark Gable"
3. double, image, look-alike
someone who closely resembles a famous person (especially an actor
"he could be Gingrich's double"
"she's the very image of her mother"
a quantity that is twice as great as another
"36 is the double of 18"
5. doubling, double
raising the stakes in a card game by a factor of 2
"I decided his double was a bluff"
"doubles" in the verb sense
1. double, duplicate
"The population doubled within 50 years"
hit a two-base hit
3. double over, double, double up
bend over or curl up, usually with laughter or pain
"He doubled and vomited violently"
do double duty serve two purposes or have two functions
"She doubles as his wife and secretary"
bridge: make a demand for (a card or suit)
6. duplicate, reduplicate, double, repeat, replicate
make or do or perform again
"He could never replicate his brilliant performance of the magic trick"
Source: WordNet® (An amazing lexical database of English)
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