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
Xavia	-	English (Rare)
Aatos	AH:-tos	Finnish
Theutrich	-	Ancient Germanic
ŠTefan	-	Slovene, Slovak, Croatian
Jaagup	-	Estonian
AttİLa	-	Turkish