Definitions:
a light blow or a jolting collision

a protuberance on a level surface

an increase

(in an online forum) an act of posting on an inactive thread in order to move it to the top of the list of active threads

a loosely woven fleeced cotton fabric used in upholstery and as lining material.

knock or run into someone or something with a jolt

move or travel with a succession of jolting movements

(of an airline) refuse (a passenger) a reserved place on a flight as a consequence of deliberate overbooking

(in an online forum) post on (an inactive thread) in order to move it to the top of the list of active threads