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Entry 5 senses · 2 variants Webster, 1913

Bumper

/bŭm'-pẽr/ · Bum·per · IPA /ˈbʌmpəɹ/
01 n. A cup or glass filled to the brim, or till the liquor runs over, particularly in drinking a health or toast.
  1. 1.
    A cup or glass filled to the brim, or till the liquor runs over, particularly in drinking a health or toast.
    “He frothed his bumpers to the brim.” — Tennyson.
  2. 2.
    A covered house at a theater, etc., in honor of some favorite performer.[Cant]
02 n. That which bumps or causes a bump.
  1. 1.
    That which bumps or causes a bump.
  2. 2.
    Anything which resists or deadens a bump or shock, such as a metal or rubber rim extending from an object; a buffer.
  3. 3.
    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.(Motor vehicles)