Bump :: Bump (n.) A swelling or prominence, resulting from a bump or blow; a protuberance..
Bump :: Bump (n.) One of the protuberances on the cranium which are associated with distinct faculties or affections of the mind; as, the bump of veneration; the bump of acquisitiveness..
Bump :: Bump (n.) The act of striking the stern of the boat in advance with the prow of the boat following.
Bump :: Bump (v. i.) To make a loud, heavy, or hollow noise, as the bittern; to boom..