Synonyms: hobby, hobbyhorse, rocking horse
Definition: a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride
Synonyms: hobbyhorse
Definition: a topic to which one constantly reverts
Usage: don't get him started on his hobbyhorse
Similar words: preoccupation
Definition: an idea that preoccupies the mind and holds the attention