ride (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 starts riding his hobby-horse about the government, there's no stopping him!

Common Names:

Name	Pronounced	Usage
Zoey	ZO-ee	English (Modern)
Sakurako	sah-koo-ṙah-ko	Japanese
Cathleen	kath-LEEN	Irish, English
Blandus	-	Ancient Roman
Vili	VEE-lee (Finnish)	Hungarian, Slovene, Finnish
'Esaw	-	Biblical Hebrew