bumper

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

• noun A cup or glass filled to the brim, or till the liquor runs over, particularly in drinking a health or toast.
• noun Cant A covered house at a theater, etc., in honor of some favorite performer.
• noun That which bumps or causes a bump.
• noun Anything which resists or deadens a bump or shock, such as a metal or rubber rim extending from an object; a buffer.
• noun (Motor vehicles) a protective guard device, usually of metal or rubber, attached horizontally to the front or rear of the frame of a vehicle, designed to resist or deaden a bump or shock, and to prevent damage to the main frame of the vehicle in low-velocity collisions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete A drinking vessel filled to the brim.
• noun colloquial Anything large or successful (now usually attributively).
• noun automotive Parts at the front and back of a vehicle which are meant to absorb the impact of a collision; fender
• noun Any mechanical device used to absorb an impact, soften a collision, or protect against impact
• noun Someone or something that bumps.
• noun cricket A bouncer.
• noun billiards A side wall of a pool table.
• noun broadcasting A short ditty or jingle used to separate a show from the advertisements.
• adjective colloquial Large; filled to the bumpers at the top of a silo.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a glass filled to the brim (especially as a toast)
• noun a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage