on one’s high horse

(idiom) to feel as if one is better than others

Example Sentences:

A: You shouldn’t drink alcohol! It is bad for your health.
B: You shouldn’t be on your high horse, you smoke!

When the boss told us we would have to cut our costs, and then bought himself a very expensive desk, we all felt like he was on his high horse.

From the Blogs:

Madonna on her high horse about her horses

Media:

Similar idioms:

1. cost an arm and a leg
2. steep
3. look a gift horse in the mouth
4. feel like a million dollars
5. drink like a fish
6. reek to high heaven
7. leave someone high and dry
8. so hungry one could eat a horse
9. take someone for granted
10. fresh off the boat