a light blow or a jolting collision

a nasty bump on the head

a protuberance on a level surface

bumps in the road

an increase

there was a bump in the number of outbound flights

(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

I'm giving this thread a well-deserved bump

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

knock or run into someone or something with a jolt

I almost bumped into him

she ran to the desk, bumping against an armchair

she bumped the girl with her hip

move or travel with a succession of jolting movements

the car bumped along the rutted track

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

if you check in on time and are bumped, you will be entitled to a full refund

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

if no one responds after 24 hours, you can bump your thread