bump · verb /bĘŚmp/Full view
B2 T to hurt part of your body by hitting it against something hard
Dictionary example:

I bumped my head on the shelf as I stood up.

bump against/into sth
B2 to hit something with force
Dictionary example:

She bumped into his tray, knocking the food onto his lap.

Learner example:

A young man ran after the ball and bumped into her. (First Certificate in English; B2; Danish)

bump into sb ()
C1 to meet someone you know when you have not planned to meet them
Dictionary example:

I bumped into Mark when I was out shopping this afternoon.

Learner example:

From the kitchen came a white-haired, overweight, pyjama-clad octagenarian, who was extremely surprised to bump into Robert. (Certificate of Proficiency in English; C2; Portuguese)

bump · noun /bĘŚmp/
bump (BODY)
C1 a raised area on your body where it has been hurt by hitting something hard
Dictionary example:

a nasty bump on the head

bump (SURFACE)
C1 a round, raised area on a surface
Dictionary example:

My bike hit a bump in the road.

Learner example:

When people don't feel safe on the streets anymore due to [the] lack of speed limit signs or speed bumps on the roads, or simply traffic lights! (Skills for Life (Level 2); C1; Polish)

Cambridge University Press