Noun
hobby horse (plural hobby horses)
(originally) The Irish hobby, an extinct breed of horse.
A child's toy consisting of a (usually wooden or cloth) horse's head mounted on a stick.
(figuratively) A topic about which someone loves to talk at great length.
Don't ask him about global warming: it's his favourite hobby horse, you'll never get away.
A puppet-like costume used in some traditional dances and festivals that gives its wearer the appearance of a man on horseback.
(cycling, historical) An early bicycle with no pedals or brakes.
Synonyms: dandy horse, draisienne
hobby-horse (plural hobby-horses)
Alternative spelling of hobby horse
hobby-horse