The verb protrude has 3 senses (first 1 from tagged texts)
1. (7) stick out, protrude, jut out, jut, project -- (extend out or project in space; "His sharp nose jutted out"; "A single rock sticks out from the cliff")
2. start, protrude, pop, pop out, bulge, bulge out, bug out, come out -- (bulge outward; "His eyes popped")
3. bulge, pouch, protrude -- (swell or protrude outwards; "His stomach bulged after the huge meal")