slate grey

slate grey (countable and uncountable, plural slate greys)

1. Alternative form of slate gray.
   • 2014 June 20, Daniel Taylor, “World Cup 2014: Uruguay sink England as Suárez makes his mark”, in guardian.co.uk:

     England were even more vulnerable under the slate-grey skies of Sáo Paulo than they had been in the searing heat of Manaus.

• grey teals