Protective bars on the front and back of a vehicle designed to absorb impacts in minor collisions.
From 'bump' (imitative word, probably from Dutch 'bommen') plus '-er' (one who does) and '-s' (plural). Originally described anything that caused bumping.
Bumper cars at amusement parks are named after car bumpers—the connection is literal and physical, making it one of the most honest names for an attraction!
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