Definition of "Bump" :

noun: an impact (as from a collision)

"The bump threw him off the bicycle."

noun: something that bulges out or is protuberant or projects from its surroundings

noun: a lump on the body caused by a blow

verb: knock against with force or violence

"My car bumped into the tree."

verb: remove or force from a position of dwelling previously occupied

verb: dance erotically or dance with the pelvis thrust forward

"Bump and grind."

verb: come upon, as if by accident; meet with

verb: assign to a lower position; reduce in rank