Hobby horse

A hobby horse (or hobbyhorse) can be several things:

• A toy horse, consisting of a model 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.
• Euphemistically, in Shakespearean times, a prostitute or promiscuous woman
• Someone's favorite topic, to which he constantly reverts.