be on (one's) high horse(redirected from be on their high horse)
be on (one's) high horse
To be adopting a haughty attitude of moral superiority. My sister was a troublemaker as a teenager, yet she's always on her high horse, lecturing me about everything. The radio host has been on his high horse all week about people sponging off the government, despite the fact that he is a known tax dodger.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
be/get on your ˌhigh ˈhorsebe annoyed because you think that somebody has not treated you with enough respect: When they suggested that she might have made a mistake, she got on her high horse and asked them how they dared question her ability.
Farlex Partner Idioms Dictionary © Farlex 2017
on one's high horse, to be
To put on airs; to behave arrogantly. As long ago as the fourteenth century, persons of high rank rode very tall horses, a custom that came to symbolize superiority and arrogance. By 1800 or so, to be or to get on one’s high horse meant to act superior, with or without justification.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer