'Bumper' definitions:

Definition of 'bumper'

From: WordNet
noun
A glass filled to the brim (especially as a toast); "we quaffed a bumper of ale"
noun
A mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage

Definition of 'Bumper'

From: GCIDE
  • Bumper \Bum"per\, n. [A corruption of bumbard, bombard, a large drinking vessel.]
  • 1. A cup or glass filled to the brim, or till the liquor runs over, particularly in drinking a health or toast. [1913 Webster]
  • He frothed his bumpers to the brim. --Tennyson. [1913 Webster]
  • 2. A covered house at a theater, etc., in honor of some favorite performer. [Cant] [1913 Webster]

Definition of 'Bumper'

From: GCIDE
  • Bumper \Bump"er\, n.
  • 1. That which bumps or causes a bump. [1913 Webster]
  • 2. Anything which resists or deadens a bump or shock, such as a metal or rubber rim extending from an object; a buffer. [1913 Webster]
  • 3. Specifically: (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. [PJC]