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
Josseline	-	French
Silvia	SEEL-vyah (Italian), SEEL-byah (Spanish)	Italian, Spanish, Portuguese, Romanian, Slovak, English, German, Late Roman, Roman Mythology
Bowles	[bəulz]
Finnbar	-	Irish
Kalisha	kə-LEESH-ə, kə-LISH-ə	African American (Rare)
Sissie	SIS-ee	English