Definition of grey-blue in US English:

grey-blue

(US gray-blue)

noun

  • A blue colour tinged with grey.

adjective

  • Of a blue colour tinged with grey; designating such a colour.

Origin

Mid 17th century; earliest use found in Henry Hexham (fl. 1601–1650), soldier and author. From grey + blue.

Pronunciation

grey-blue

/ˌɡreɪˈbluː/