We have no meanings for "grey hours" in our records yet.
1 In the grey hours before the dawn, Dr Hughes awoke from his fitful sleep.
2 After the long grey hours of rain and mist.
3 The dull grey hours passed without event.
4 She was equally certain in the grey hours of dawn that she would have to ring Anna as soon as it got light.
5 They buried Willoughby in the grey hours of the morning, in a vast cemetery outside the city walls, to which Sun Kai brought them.
6 In the cold grey hours we glided into Dover or Folkestone (I was too anaemic to care which) and fastened up alongside the wharf.
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