Bumper

bumper
    n 1: a glass filled to the brim (especially as a toast); "we
         quaffed a bumper of ale"
    2: a mechanical device consisting of bars at either end of a
       vehicle to absorb shock and prevent serious damage
    

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.
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            He frothed his bumpers to the brim.   --Tennyson.
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   2. A covered house at a theater, etc., in honor of some
      favorite performer. [Cant]
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Bumper \Bump"er\, n.
   1. That which bumps or causes a bump.
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   2. Anything which resists or deadens a bump or shock, such as
      a metal or rubber rim extending from an object; a buffer.
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   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]
    

138 Moby Thesaurus words for "bumper":
      aegis, arm guard, backstop, barrier, bellyful, beverage, big,
      brattice, buffer, buffer state, bulkhead, bulwark, capacity,
      charge, cloison, collision mat, complement, considerable,
      contraceptive, copyright, cram, crash helmet, crush, cushion,
      dashboard, diaphragm, dissepiment, dividing line, dividing wall,
      division, dodger, draft, dram, drench, drink, face mask, fender,
      fill, finger guard, foot guard, full house, full measure, fuse,
      goggles, goodly, governor, grand, great, guard, guardrail, gulp,
      guzzle, hand guard, handrail, hard hat, healthy, helmet,
      insulation, interlock, interseptum, jam up, knee guard,
      knuckle guard, lading, laminated glass, lap, large, large-scale,
      libation, life preserver, lifeline, lightning conductor,
      lightning rod, load, man-sized, mask, mat, midriff, midsection,
      mouthful, mudguard, nip, nose guard, numerous, pad, padding,
      palladium, panel, paries, partition, party wall, patent, peg,
      pilot, portion, potation, preventive, property line, prophylactic,
      protective clothing, protective umbrella, pull, quaff, safeguard,
      safety, safety glass, safety plug, safety rail, safety shoes,
      safety switch, safety valve, screen, seat belt, separation,
      septulum, septum, shield, shin guard, shock pad, sip, sizable,
      skinful, slurp, snootful, snort, substantial, suck, sun helmet,
      sup, swig, swill, tall, tidy, tot, umbrella, wall, windscreen,
      windshield