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
Justus	YUWS-tuws (German), JUS-təs (English)	German, Dutch, Late Roman
Shaye	SHAY	English (Rare)
Kord	KAWRT	German
Yakub	-	Arabic
Lambert	['læmbət]
Anona	-	English