on one’s high horse

on (one's) high horse

Having an attitude of condescending moral superiority. My sister was a troublemaker as a teenager, yet she's always on her high horse lecturing me about my life choices. The radio host is known for climbing on his high horse when talking to listeners and guests about the importance of family values.
See also: high, horse, on

on one’s high horse

mod. in a haughty manner or mood; bossy. Larry is on his high horse again, bossing people around.
See also: high, horse, on