Grey is an alternate spelling for the word gray, which is a color derived from mixing white and black. The word has also come to stand in for other mixtures as well. A person in a grey mood feels gloomy.

If you are commanding a military force and you’re not sure whether you should attack a crowd that is half enemy fighters and half innocent citizens, you could say the decision falls in a grey zone. Grey can be a verb too. When you get old, your hair will grey if you don’t go bald first.

Definitions of grey
  1. adjective
    of an achromatic color of any lightness intermediate between the extremes of white and black
    “the little grey cells”
    synonyms: gray, grayish, greyish
    achromatic, neutral
    having no hue
  2. noun
    a neutral achromatic color midway between white and black
    synonyms: gray, grayness, greyness
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    ash gray, ash grey, silver, silver gray, silver grey
    a light shade of grey
    charcoal, charcoal gray, charcoal grey, oxford gray, oxford grey
    a very dark grey color
    dapple-gray, dapple-grey, dappled-gray, dappled-grey
    grey with a mottled pattern of darker grey markings
    iron-gray, iron-grey
    the color of freshly broken cast iron
    tattletale gray, tattletale grey
    a greyish white
    Davy's gray, Davy's grey, iron blue, steel gray, steel grey
    slightly purplish or bluish dark grey
    type of:
    achromatic color, achromatic colour
    a color lacking hue; white or grey or black
  3. verb
    make grey
    “The painter decided to grey the sky”
    synonyms: gray
  4. verb
    turn grey
    “Her hair began to grey
    synonyms: gray
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    type of:
    color, colour, discolor, discolour
    change color, often in an undesired manner
  5. noun
    clothing that is a grey color
    “he was dressed in grey
    synonyms: gray
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    type of:
    article of clothing, clothing, habiliment, vesture, wear, wearable
    a covering designed to be worn on a person's body
  6. noun
    any organization or party whose uniforms or badges are grey
    “the Confederate army was a vast grey
    synonyms: gray
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    Army of the Confederacy, Confederate Army
    the southern army during the American Civil War
    type of:
    organisation, organization
    a group of people who work together
  7. adjective
    used to signify the Confederate forces in the American Civil War (who wore grey uniforms)
    “a stalwart grey figure”
    synonyms: gray
    in or characteristic of a region of the United States south of (approximately) the Mason-Dixon line
  8. adjective
    showing characteristics of age, especially having grey or white hair
    synonyms: gray, gray-haired, gray-headed, grey-haired, grey-headed, grizzly, hoar, hoary, white-haired
    (used especially of persons) having lived for a relatively long time or attained a specific age
  9. adjective
    intermediate in character or position
    “a grey area between clearly legal and strictly illegal”
    synonyms: gray
    lying between two extremes in time or space or state
  10. noun
    horse of a light gray or whitish color
    synonyms: gray
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    type of:
    mount, riding horse, saddle horse
    a lightweight horse kept for riding only
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