n.

1. a lump on the body caused by a blow
2. something that bulges out or is protuberant or projects from its surroundings;
   bulge, hump, gibbosity, gibbousness, jut, prominence, protuberance, protrusion, extrusion, excrescence
   
   • the gun in his pocket made an obvious bulge
   • the hump of a camel
   • he stood on the rocky prominence
   • the occipital protuberance was well developed
   • the bony excrescence between its horns
3. an impact (as from a collision);
   blow
   
   • the bump threw him off the bicycle

v.

1. knock against with force or violence;
   knock
   
   • My car bumped into the tree
2. come upon, as if by accident; meet with;
   find, happen, chance, encounter
   
   • We find this idea in Plato
   • I happened upon the most wonderful bakery not very far from here
   • She chanced upon an interesting book in the bookstore the other day
3. dance erotically or dance with the pelvis thrust forward
   
   • bump and grind
4. assign to a lower position; reduce in rank;
   demote, relegate, break, kick downstairs
   
   • She was demoted because she always speaks up
   • He was broken down to Sergeant
5. remove or force from a position of dwelling previously occupied;
   dislodge, displace
   
   • The new employee dislodged her by moving into her office space