Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: hobby 'small horse' (14-19 centuries) (probably from Hobbin, a man's name, from Robin) + horse

hobbyhorse

noun
     
Related topics: Toys
hob‧by‧horse [countable]
1 a subject that someone has strong opinions about and that they talk about too much:
I'm afraid safe driving isn't Jaqui's only hobbyhorse.
be on your hobbyhorse
Vicky was on her hobbyhorse again.
2DHT an old-fashioned toy made of a horse's head on a stick

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