Definition of guard rail noun from the Oxford Advanced Learner's Dictionary


    guard rail

    BrE BrE//ˈɡɑːd reɪl//
    ; NAmE NAmE//ˈɡɑːrd reɪl//
    Controlling traffic, Parts of boats and ships
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  1. 1a rail placed on the edge of a path, a cliff or a boat to protect people and prevent them falling over the edge See related entries: Parts of boats and ships
  2. 2(North American English) (British English crash 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 See related entries: Controlling traffic
See the Oxford Advanced American Dictionary entry: guard rail

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