Bulge

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.
to swell or bend outward; be protuberant.
to be filled to capacity:
The box bulged with cookies.
to make protuberant; cause to swell.
Battle of the, the final major German counteroffensive in World War II, begun December 16, 1944, and thrusting deep into Allied territory in N and E Belgium: repulsed January 1945.
Contemporary Examples

Can This Dog Solve the Black Dahlia Homicide? Christine Pelisek February 2, 2013
Newest U.S. Stealth Fighter ‘10 Years Behind’ Older Jets Dave Majumdar December 25, 2014
The Fall of the Wall: The Rise of Freedom Robert M. Kimmitt November 6, 2009
Idris Elba’s Battle of the Bulge: Moose Knuckles and Sexist Double Standards Keli Goff August 10, 2014
Meet the Chef Fighting to Ensure That Brazilians Will Never Be as Fat as Americans Brandon Presser June 24, 2014

Historical Examples

Ann Arbor Tales Karl Edwin Harriman
The Grell Mystery Frank Froest
The Automobile Storage Battery O. A. Witte
The Girl on the Boat Pelham Grenville Wodehouse
The Palace of Darkened Windows Mary Hastings Bradley

noun
a swelling or an outward curve
a sudden increase in number or volume, esp of population
(Brit) another name for baby boom
(Brit) the projecting part of an army’s front line; salient
verb
to swell outwards
noun
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
n.
v.

An advantage; a lead: running up a 20–0 bulge/ the Californians fashioned a two-run bulge of their own (1840s+)
A usually fatty surplus on the waist, buttocks, etc; spare tire (1940s+)