bumperPronunciation: /ˈbʌmpə/Translate bumper | into French | into German | into Italian | into Spanish Definition of bumper noun 1a horizontal bar fixed across the front or back of a motor vehicle to reduce damage in a collision: she started the car with a jerk and hit the bumper of the car in front 2 Cricket, datedanother term for bouncer (sense 2). 3 (also bumper race) Horse Racing a flat race for inexperienced horses which are intended for future racing in hurdles or steeplechases. [said to be from an earlier racing term bumper 'amateur rider'] 4 archaic a generous glassful of an alcoholic drink, typically one drunk as a toast. adjective exceptionally large, fine, or successful:a bumper cropPhrases bumper-to-bumper very close together, as cars in a traffic jam. (of an insurance policy) comprehensive; all-inclusive: choose our 3-year/36,000-mile bumper-to-bumper warrantybumper in other Oxford dictionaries Definition of bumper in the US English dictionary