"bump" as noun
1 - A light blow or jolting collision.
2 - The sound of such a collision.
3 - A protuberance on a level surface.
"bump" as verb
1 - To knock against or run into with a jolt.
2 - To move up or down by a step; displace.
3 - To post in an Internet forum thread in order to raise the thread's profile by returning it to the top of the list of active threads.
