doubling (Noun) — Increase by a factor of two. ex. "doubling with a computer took no time at all"
doubling (Noun) — Raising the stakes in a card game by a factor of 2. ex. "I decided his doubling was a bluff"
doubling (Verb) — Increase twofold. ex. "The population doubled within 50 years"
doubling (Verb) — (baseball) hit a two-base hit.
doubling (Verb) — Bend over or curl up, usually with laughter or pain. ex. "He doubled and vomited violently"
doubling (Verb) — Do double duty; serve two purposes or have two functions. ex. "She doubles as his wife and secretary"
doubling (Verb) — (bridge) make a demand for (a card or suit).
doubling (Verb) — Make, do or perform again. ex. "He could never double his brilliant performance of the magic trick"