Definition of bumper noun from the Oxford Advanced American Dictionary

 

bumper

 noun
noun
NAmE//ˈbʌmpər//
 
 
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a bar attached to the front and back of a car, etc. to reduce the effect if it hits anything The cars were bumper to bumper on the road to the coast (= so close that their bumpers were almost touching).
See the Oxford Advanced Learner's Dictionary entry: bumper