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