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.
(of a superheated liquid) To suddenly boil, causing movement of the vessel and loss of liquid.
To move (a booked passenger) to a later flight because of earlier delays or cancellations.
To move the time of (a scheduled event).
To pick (a lock) with a repeated striking motion that dislodges the pins.
To make a loud, heavy, or hollow noise; to boom.
To spread out material so as to fill any desired number of pages.
The sound or action of a bump.