(third-person singular simple present bumps, present participle bumping, simple past and past participle bumped)
- To knock against or run into with a jolt.
- To move up or down by a step.
- I bumped the font size up to make my document easier to read.
- (Internet) To post in an Internet forum thread in order to raise the thread's profile by returning it to the top of the list of active threads.
- (chemistry, of a superheated liquid) To suddenly boil, causing movement of the vessel and loss of liquid.
- To move (a booked passenger) to a later flight because of earlier delays or cancellations.
- To move the time of a scheduled event.
- (archaic) To make a loud, heavy, or hollow noise; to boom.
From Early Modern English bump (“a shock, blow from a collision", also "to make a heavy, hollow sound, boom”), probably of North Germanic origin. Compare Danish bump (“a thump”), Danish bumpe (“to thump”), Old Danish bumpe (“to strike with a clenched fist”). Apparently related to Middle English bumben, bummen (“to make a hollow noise”), Dutch bommen (“to hum, buzz”), German bummen (“to hum, buzz”), Icelandic bumba (“drum”), probably of imitative origin. More at bum, bumble. Compare also bomb.