Definition of ringer noun from the Oxford Advanced American Dictionary

     

    ringer

     noun
    noun
    NAmE//ˈrɪŋər//
     
     
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  1. 1= bell-ringer
  2. 2 a horse or person that takes part in a race illegally, for example by using a false name
  3. Idioms
    be a dead ringer for somebody(informal)
     
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    to look very like someone She's a dead ringer for a girl I used to know.
See the Oxford Advanced Learner's Dictionary entry: ringer