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hobbyhorse

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hobby-horse

A subject, topic, or issue about which one frequently or incessantly talks, expounds, or complains. Ah, here we go again. Once grandpa gets on his hobby-horse about the government, there's no stopping him!

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!

See also: get, on

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!

See also: ride

on your hobbyhorse

if someone is on their hobbyhorse, they are talking about a subject which they think is interesting and important, and which they talk about at any time that they can, even if other people are not interested Don't mention tax, or Bernard'll get on his hobbyhorse again.

See also: hobbyhorse, on