hobbyhorse
Noun
Meaning
A strong, active horse, of a middle size, said to have been originally from Ireland; an ambling nag.
A stick, often with the head or figure of a horse, on which boys make believe to ride.
A subject or plan upon which one is constantly setting off; a favorite and ever-recurring theme of discourse, thought, or effort; that which occupies one's attention unduly, or to the weariness of others; a ruling passion.
Source: Webster's dictionarySynonyms
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Examples
don't get him started on his hobbyhorse
Another theory says that the name "Dada" came during a meeting of the group when a paper knife stuck into a French-German dictionary happened to point to 'dada', a French word for 'hobbyhorse'.
The choice of topic was chosen less from Grierson's curiosity than the fact that he discovered that the Financial Secretary had made the herring industry his hobbyhorse.