noun

a rounded swelling which distorts an otherwise flat surface.

the telltale bulge of a concealed weapon

swelling,bump,lump,protuberance,protrusion,prominence,projection,eruption,convexity,intumescence

verb

swell or protrude to an incongruous extent.

the veins in his neck bulged

swell,swell out,puff up/out,stick out,balloon,balloon up/out,fill out,bag,belly,project,protrude,jut (out),stand out,be prominent,expand,inflate,distend,dilate,enlarge,bloat,intumesce,tumefy