Definition of blue-gray:
(adj) :
Of a blue hue.
(adj) :
(informal) Depressed, melancholic, sad.
(adj) :
Having a bluish or purplish shade to the skin due to a lack of oxygen to the normally deep-red red blood cells; cyanotic.
(adj) :
(of a flame) Pale, without redness or glare.
(adj) :
(politics) Supportive of, run by (a member of), pertaining to, or dominated by a political party represented by the colour blue.
(adj) :
(US politics) Supportive of, run by (a member of), pertaining to, or dominated by the Democratic Party.