Definition of hobby horse noun from the Oxford Advanced Learner's Dictionary

     

    hobby horse

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1(sometimes disapproving) a subject that somebody feels strongly about and likes to talk about to get on your hobby horse (= talk about your favourite subject)
  2. 2a toy made from a long stick that has a horse’s head at one end. Children pretend to ride on it.