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
Pushpa	-	Indian, Hindi, Marathi, Kannada, Tamil, Telugu, Nepali
Lia (2)	LEE-ah (Italian)	Italian, Dutch
Fiacre	-	French
Sorrel	SAWR-əl	English (Rare)
Katy	['keiti]
Stav	-	Hebrew