To bump is defined as to collide lightly.
(verb)An example of to bump is for a car to knock gently into the back of another.
The definition of a bump is a light jolt or a swollen, raised lump on the body.
(noun)See bump in Webster's New World College Dictionary
transitive verb
Origin: echoic
intransitive verb
noun
See bump in American Heritage Dictionary 4
verb bumped, bump·ing, bumps verb, transitive
Origin:
Origin: Imitative
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