• Slang metonym for penis
  Penis
  The penis is a biological feature of male animals including both vertebrates and invertebrates...
  
  , referring to a visible protrusion through clothing
• Hernia
  Hernia
  A hernia is the protrusion of an organ or the fascia of an organ through the wall of the cavity that normally contains it. A hiatal hernia occurs when the stomach protrudes into the mediastinum through the esophageal opening in the diaphragm....
  
  , sometimes referred to as a bulge or bulge out

Military

• A localized discontinuity in an extended military line
  Line (formation)
  The line formation is a standard tactical formation which has been used in Early modern warfare.It continues the phalanx formation or shield wall of infantry armed with polearms in use during antiquity and the Middle Ages....
  
  
  • Battle of the Bulge
    Battle of the Bulge
    The Battle of the Bulge was a major German offensive , launched toward the end of World War II through the densely forested Ardennes mountain region of Wallonia in Belgium, hence its French name , and France and...
    
    , a major World War II German offensive on the Western front starting in 1944

Astronomy

• Bulge (astronomy)
  Bulge (astronomy)
  In astronomy, a bulge is a tightly packed group of stars within a larger formation. The term almost exclusively refers to the central group of stars found in most spiral galaxies...
  
  , a tightly packed group of stars at the center of a spiral galaxy
• Equatorial bulge
  Equatorial bulge
  An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the centrifugal force of its rotation. A rotating body tends to form an oblate spheroid rather than a sphere...
  
  , a bulge around the equator of a planet due to rapid rotation
• Tidal bulge, a bulge of land or water on a planet created by the pull of another object in orbit