American English

Definition of guard rail noun from the Oxford Advanced American Dictionary

     

    guard rail

     noun
    noun
     
     
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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
  2. 2 a strong low fence or wall at the side of a road or between the two halves of a major road such as a highway or interstate
See the Oxford Advanced Learner's Dictionary entry: guard rail