BUMPS

A light blow or jolting collision.

The sound of such a collision.

A protuberance on a level surface.

To knock against or run into with a jolt.

To move up or down by a step; displace.

"I bumped the font size up to make my document easier to read."

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.