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bumper (n.)

1670s, "glass filled to the brim;" perhaps from notion of bumping as "large," or from a related sense of "booming" (see bump (v.)). Meaning "anything unusually large" (as in bumper crop) is from 1759, originally slang. Agent-noun meaning "buffer of a car" is from 1839, American English, originally in reference to railway cars; 1901 of automobiles (in phrase bumper-to-bumper, in reference to a hypothetical situation; of actual traffic jams by 1908).

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Definitions of bumper from WordNet

bumper (n.)
a glass filled to the brim (especially as a toast);
we quaffed a bumper of ale
bumper (n.)
a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage;
From wordnet.princeton.edu