Meaning

noun a lump on the body caused by a blow

noun something that bulges out or is protuberant or projects from its surroundings

noun an impact (as from a collision)

originFrom Early Modern English bump (“a shock, blow from a collision”), probably of North Germanic origin; compare Danish bump (“a thump”), Danish bumpe (“to thump”), Old Danish bumpe (“to strike with a clenched fist”), all probably of imitative origin. Apparently related to Middle English bumben, bummen (“to make a hollow noise”), Dutch bommen (“to hum, buzz”), German Low German bumsen (“to bump,…

Etymology from Wiktionary, CC BY-SA 3.0