bumper guard

English Thesaurus

1. vertical bars attached to a bumper to prevent locking bumpers with another vehicle (noun.artifact)

hypernym	:	mechanical device,
definition	:	mechanism consisting of a device that works on mechanical principles (noun.artifact)

part meronym	:	bumper,
definition	:	a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage (noun.artifact)