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
Nicolas	['nikələs]
Alwin	['ælwin]
BlaŽ	-	Slovene, Croatian
Roelof	-	Dutch
Hana (2)	-	Czech, Slovak, Croatian
Elicia	ə-LISH-ə, ə-LISH-yə	English (Rare)