Longman Dictionary of Contemporary English - grey

~1 usually gray AmE adj 1 »COLOUR« having a colour of black mixed with white, like the colour of ash  (an old lady with grey hair | a grey sky) 2 »HAIR« having grey hair  (go grey)  (My brother went grey in his forties.) 3 »FACE« looking pale because you are tired, frightened, or ill  (Noel's face was gray with fatigue.) 4 »BORING« boring and unattractive; gloomy  (the grey anonymous men in government offices) 5 »OF OLD PEOPLE« BrE connected with old people  (the grey vote) 6 grey area an area of law or science that cannot be dealt with in a definite way because it is outside those areas that have clear rules and limits ~2 usually gray AmE n the colour of smoke and rain clouds  (dull greys and browns) ~3 usually gray AmE v  if someone greys, their hair becomes grey  (Jim's beginning to gray at the temples.)