something that bulges out or is protuberant or projects from its surroundings; "the gun in his pocketmade an obvious bulge"; "the hump of a camel"; "he stood on the rocky prominence"; "the occipital protuberance was well developed"; "the bony excrescence between its horns"
an impact (as from a collision); "the bump threw him off the bicycle"
(verb) knock against with force or violence; "My car bumped into the tree"