Meaning of “bump” - Learner’s Dictionary

bump

noun [ C ] uk us /bʌmp/
SURFACE

a round, raised area on a surface:

My bike hit a bump in the road.
BODY

a raised area on your body where it has been hurt by hitting something hard:

a nasty bump on the head
SOUND

the sound of something hitting another thing hard:

I heard a bump upstairs.

(Definition of “bump noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)