Hobbyhorse

1. (n.) A strong, active horse, of a middle size, said to have been originally from Ireland; an ambling nag.

2. (n.) A stick, often with the head or figure of a horse, on which boys make believe to ride.

3. (n.) 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.

Thesaurus Entries

agate, avocation, ball, baseball bat, bat, battledore, bauble, blocks, by-line, checkerboard, chessboard, club, cockhorse, cricket bat, cue, doll, doll carriage, gewgaw, gimcrack, golf club, hobby, jack-in-the-box, jacks, jackstones, jackstraws, kickshaw, knickknack, marble, marionette, mig, paper doll, pastime, pick-up sticks, pinwheel, plaything, puppet, racket, rag doll, rocking horse, side interest, sideline, spare-time activity, sport, steelie, taw, teetotum, top, toy, toy soldier, trinket, whim-wham