Bump

1. To make a loud, heavy, or hollow noise, as the bittern; to boom.
2. A thump; a heavy blow.
3. 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."
4. A swelling or prominence, resulting from a bump or blow; a protuberance.
5. To strike, as with or against anything large or solid; to thump; as, to bump the head against a wall.
6. The noise made by the bittern.
7. To come in violent contact with something; to thump.
8. The act of striking the stern of the boat in advance with the prow of the boat following.