■ noun
1》 a light blow or a jolting collision.
↘ Rowing (in races where boats make a spaced start one behind another) the point at which a boat begins to overtake or touch the boat ahead, thereby defeating it.
2》 a protuberance on a level surface.
↘ dated a lump on a person's skull, formerly thought to indicate a particular mental faculty.
3》 Aeronautics a rising air current causing an irregularity in an aircraft's motion.
■ verb
1》 knock or run into with a jolt.
↘( ~ into ) meet by chance.
↘ Rowing gain a ~ against.
2》 move or travel with much jolting.
3》 ( ~ someone off ) informal murder someone.
4》 ( ~ something up ) informal make something larger or appear to be larger.
5》 refuse (a passenger) a reserved place on a flight because of deliberate overbooking by the airline.
↘ N. Amer. displace from a job or position.
Origin
C16 (as v.): imitative, perh. of Scand. origin.