A hobby horse (or hobbyhorse) can be several things:
A toyhorse, consisting of a horse's head, usually wooden, attached to a stick. This is often used by children to simulate riding a horse, see Hobby-horse.
A toy horse suspended by springs from a frame
A rocking horse
The figure of a horse fastened around the waist in the Morris dance.
Someone's favorite topic, to which he constantly reverts.
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