A bump is an unexpected hit or collision with something.
When you're driving and someone cuts you off, you might get into a traffic bump. Or if you trip on a rock while walking, that's a bump too. Sometimes a bump can be a small obstacle that you need to climb over, like a hill in the road. In other cases, it can be a rough spot that makes something unpleasant happen, like a pain after eating something spicy.
To knock against or run into with a jolt.
To move up or down by a step; displace.
Example: 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.
