hobbyhorses
hob-by-hor-ses
noun
A favourite topic or idea someone frequently discusses, often to others' annoyance.
"He's always riding his political hobbyhorses."
noun
Children's toy: a stick with a horse's head for riding.
"The toddlers galloped on their hobbyhorses."
Thesaurus
Synonyms: hobbyhorse, hobby, rocking horse