If you bump into something or someone, you accidentally hit them while you are moving.

A bump is the action or the dull sound of two heavy objects hitting each other.

A bump is a minor injury or swelling that you get if you bump into something or if something hits you.

If you have a bump while you are driving a car, you have a minor accident in which you hit something.

A bump on a road is a raised, uneven part.

If a vehicle bumps over a surface, it travels in a rough, bouncing way because the surface is very uneven.

If someone comes down to earth with a bump, they suddenly start recognizing unpleasant facts after a period of time when they have not been doing this.