white rider

black rider

Famine, one of the Four Horsemen of the Apocalypse.

black-and-white

Classifying people, objects or concepts as two polar opposites, especially "right" and "wrong"; dichotomous and inflexible.

pale rider

Death, the Grim Reaper or angel of death; and one of the Four Horsemen of the Apocalypse.

red rider

War, one of the Four Horsemen of the Apocalypse.

wash a blackamoor white

To labour in vain, especially so as to present something as better than it really is; to whitewash.

white bread

Bread made from white flour.

white coat hypertension

Elevated blood pressure measured by a medical practitioner and deemed to result from the patient's emotional response to the medical environment.

white hat

A good person; a hero.