Definition of hobbyhorse noun from the Oxford Advanced American Dictionary

     

    hobbyhorse

     noun
    noun
    NAmE//ˈhɑbiˌhɔrs//
     
     
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  1. 1(sometimes disapproving) a subject that someone feels strongly about and likes to talk about to get on your hobbyhorse (= talk about your favorite subject)
  2. 2a toy made from a long stick that has a horse's head at one end. Children pretend to ride on it.