guardrail /ˈgɑɚdˌreɪl/ noun plural guardrails
plural guardrails
Learner's definition of GUARDRAIL
[count]
1
US : a strong metal bar along the side of a road that prevents vehicles from driving off the road(道路的)防撞护栏 — called also (British) crash barrier
2
: a strong bar or fence that prevents people from falling off a deck, bridge, etc.(船甲板、桥梁等的)护栏,栏杆