guardrail

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guardrail /ˈgɑɚdˌreɪl/ noun
plural guardrails
guardrail
/ˈgɑɚdˌreɪl/
noun
plural guardrails
Learner's definition of GUARDRAIL
[count]
US : a strong metal bar along the side of a road that prevents vehicles from driving off the road
called also (British) crash barrier
: a strong bar or fence that prevents people from falling off a deck, bridge, etc.