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

hobby horse

noun
 
/ˈhɒbi hɔːs/
 
/ˈhɑːbi hɔːrs/
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  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. a toy made from a long stick that has a horse’s head at one end. Children pretend to ride on it.
trait
noun
 
 
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