- 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.
Meaning of 'hobbyhorse' (Princeton's WordNet)
1 . hobbyhorse
[ n]
Meaning (1): - a topic to which one constantly reverts