Definition of wake-up call noun from the Oxford Advanced American Dictionary

     

    wake-up call

     noun
    noun
     
     
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  1. 1 a telephone call that you arrange to be made to you at a particular time, for example in a hotel, in order to wake you up I asked for a 6:30 a.m. wake-up call.
  2. 2an event that makes people realize that there is a problem that they need to do something about These riots should be a wake-up call for the government.
See the Oxford Advanced Learner's Dictionary entry: wake-up call