noun1. a toy consisting of a stick with a figure of a horse's head at one end
2. another word for rocking horse
3. a figure of a horse attached to a performer's waist in a pantomime, morris dance, etc
4. a favourite topic or obsessive fixed idea (esp in the phrase on one's hobbyhorse)
verb5. (intransitive) nautical (of a vessel) to pitch violently
Word origin
C16: from
hobby1, originally a small horse, hence sense 3; then generalized to apply to any pastime