guard railBrE /ˈɡɑːd reɪl/ 🔊NAmE /ˈɡɑːrd reɪl/ 🔊 nouna rail placed on the edge of a path, a cliff or a boat to protect people and prevent them falling over the edge 护栏；扶栏(NAmE) (BrE ˈcrash barrier) a strong low fence or wall at the side of a road or between the two halves of a major road such as a motorway or interstate （高速公路或州际公路上的）防撞护栏，防撞墙