great white horse
Definition
A large and majestic horse with white fur, often romanticized in folklore, literature, and fairy tales as a symbol of heroism or purity.
In the White Horse Prophecy attributed to Joseph Smith of the Latter-day Saint movement, 'the Great White Horse' refers symbolically to a gathering force of righteousness, sending out elders to collect the honest-hearted amid chaotic times.
Examples
He finally showed up to the party on his great white horse—turns out it was just an Uber with a vinyl wrap.
In her daydreams, the knight arrives on a great white horse, but reality delivers a guy on a fixie bike with a latte.
The rancher's prize great white horse became an internet sensation after photobombing every selfie.
Promising to sweep her off her feet, he borrowed a great white horse from the petting zoo—romance level: chaotic neutral.