noun

• (obsolete) One of the protuberances on the cranium which, in phrenology, are associated with distinct faculties or affections of the mind. Also (dated, metonymic) the faculty itself
  "the bump of veneration; the bump of acquisitiveness"
• (rowing) The point, in a race in which boats are spaced apart at the start, at which a boat begins to overtake the boat ahead.
• (Internet) A post in an Internet forum thread made in order to raise the thread's profile by returning it to the top of the list of active threads.
• (slang) A dose of a drug such as ketamine or cocaine, when snorted recreationally.
  "“They're getting their drugs mixed up,” she said. “If someone did a line of coke, it would be a very different size than if someone did a bump of ketamine, right? So if they're thinking it's cocaine and they do a line, they could go into a k-hole and be completely unable to move for hours. Maybe not hours, but for a while.”"

verb

• (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.
  "As in [the online forum] carersvoicesnz, certain contributors were more visible, taking the initiative to "bump" the thread to bring it back into view if it went quiet."
• (physical chemistry, of a superheated liquid) To suddenly boil, causing movement of the vessel and loss of liquid.
  "Heat until the liquid bumps, then reduce the heat and continue the boiling for 1½ hours."
• (transitive) To move (a booked passenger) to a later flight because of earlier delays or cancellations.
  "Easyjet said the compensation package for passengers bumped off flights was 'probably the most flawed piece of European legislation in recent years' […]"
• (transitive) To move the time of (a scheduled event).
  "A colleague emails with news that her 4:30 meeting got bumped to 3:30."

intj

• (Internet) Posted 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.

intj

• (Internet) Alternative form of bump.