Definition of emergency brake noun from the Oxford Advanced American Dictionary

     

    emergency brake

     noun
    noun
     
     
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  1. 1(also parking brake, handbrake) a brake in a vehicle that is is used to stop the vehicle moving, especially when it is parked to put the emergency brake on to take the emergency brake off Is the emergency brake on? collocations at driving
  2. 2a brake on a train that can be pulled in an emergency
See the Oxford Advanced Learner's Dictionary entry: emergency brake