n. One who or that which bumps.n. A log of wood placed over a ship's side to keep off ice, or anything similarly used; a fender.n. A cup or glass filled to the brim, especially when drunk as a toast.n. A crowded house at a theatrical benefit, or the like.To fill to the brim.n. A species of pompano-like fish, Chloroscombrus chrysurus, of the family Carangidæ, found on the South Atlantic coast and about Cuba. Also called casabe.n. In felt-hat manuf., a machine used for consolidating the felted material.n. In Eng. whist, a rubber of 8 points.Brimming; abundant; very good; as, a bumper crop.To toast by drinking off a bumper.To drink bumpers: as, “we all sang and bumpered away,”n. In pianoforte-making, same as counter-check, 2.