get on (one's) hobby-horse

To frequently or incessantly talk or complain about a subject, topic, or issue in which one is excessively interested. Ah, here we go again. Once grandpa gets on his hobby-horse about the government, there's no stopping him!

Common Names:

Name	Pronounced	Usage
Cruzita	kroo-THEE-tah (Spanish), kroo-SEE-tah (Latin American Spanish)	Spanish
Luther	LOO-thər	English
Maddalena	mahd-dah-LE-nah	Italian
Hitomi	hee-to-mee	Japanese
Kealoha	-	Hawaiian
Andras	-	Welsh