A topic about which someone loves to talk at great length.
A child's toy consisting of a (usually wooden or cloth) horse's head mounted on a stick.
The Irish hobby, an extinct breed of horse.
A puppet-like costume used in some traditional dances and festivals that gives its wearer the appearance of a man on horseback.
An early bicycle with no pedals or brakes; a draisienne.
A talk about one's pet topic (or the topic itself), especially when only tangentially relevant to an ongoing discussion.
A soapbox car.
A crate for packing soap.
Any physical or media platform which gives prominence to the person on it and the views they espouse.
To give a speech from (or as if from) a soapbox.