"doubling" in the noun sense

1. doubling

increase by a factor of two

"doubling with a computer took no time at all"

2. doubling, double

raising the stakes in a card game by a factor of 2

"I decided his double was a bluff"

"doubling" in the verb sense

1. double, duplicate

increase twofold

"The population doubled within 50 years"

2. double

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"

4. double

do double duty serve two purposes or have two functions

"She doubles as his wife and secretary"

5. double

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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