n.
   - a rounded swelling distorting a flat surface.
 - Military  a piece of land projecting outwards from an otherwise regular line.
 - informal a temporary increase:
 a bulge in the birth rate.
 
v.
 swell or protrude to an unnatural extent. 
▸be full of and distended with.
 
  Derivative
  
    - bulging adj.
  - bulgingly adv.
  - bulgy adj.
 
   
  Etymology
  ME (in the sense ‘wallet or bag’): from OFr. boulge, from L. bulga (see budget).