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
Hristofor	-	Bulgarian, Macedonian
Sheri	SHER-ee	English
Sholto	-	Scottish
KÁRi	-	Ancient Scandinavian
Friduman	-	Ancient Germanic
Lavrentiy	-	Russian