Bump

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

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.