to strike, as with or against anything large or solid; to thump; as, to bump the head against a wall.-to come in violent contact with something; to thump.-a thump; a heavy blow.-a swelling or prominence, resulting from a bump or blow; a protuberance.-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."-the act of striking the stern of the boat in advance with the prow of the boat following.-to make a loud, heavy, or hollow noise, as the bittern; to boom.-the noise made by the bittern.