a rounded projection, bend, or protruding part; protuberance; hump: a bulge in a wall.
any sudden increase, as of numbers, sales, or prices: the bulge in profits.
a rising in small waves on the surface of a body of water, caused by the action of a fish or fishes in pursuit of food underwater.
verb (used without object), bulged, bulging.
to swell or bend outward; be protuberant.
to be filled to capacity: The box bulged with cookies.
verb (used with object), bulged, bulging.
to make protuberant; cause to swell.

1200–50; Middle English: bag, hump < Old French < Latin bulga bag < Celtic; compare Irish bolg bag

bulgingly, adverb
outbulge, verb, outbulged, outbulging.

4. protrude, project, stick out.

See bulk1.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bulge (bʌldʒ)
1.  a swelling or an outward curve
2.  a sudden increase in number or volume, esp of population
3.  (Brit) another name for baby boom
4.  (Brit) the projecting part of an army's front line; salient
5.  to swell outwards
[C13: from Old French bouge, from Latin bulga bag, probably of Gaulish origin]

Bulge (bʌldʒ)
Battle of the Bulge (in World War II) the final major German counteroffensive in 1944 when the Allied forces were pushed back into NE Belgium; the Germans were repulsed by Jan 1945

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1200, from O.Fr. bouge "wallet, pouch, leather bag" (see budget). Sense of "swelling" is first recorded 1620s. The verb is first recorded 1670s. Related: Bulged; bulging. Bilge (q.v.) may be a nautical variant.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The northern flank of the mountain was bulging outward at a rate of more than
  one meter per day as magma built up inside.
If your cymbidium orchids are bulging out of their containers or the bark has
  decomposed, it's time to repot them.
Colleges face a challenge to masculinity that bulging muscles, rumbling voices,
  and jacked-up pickup trucks won't remedy.
For example, bulging of the mirror surface can defocus a laser beam.
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