Source : Webster's Revised Unabridged Dictionary (1913)

Gley \Gley\, v. i. [OE. gli[yogh]en, glien, gleien, to shine, to
   squint; cf. Icel. glj[=a] to glitter.]
   To squint; to look obliquely; to overlook things. [Scot.]
   --Jamieson.

Gley \Gley\, adv.
   Asquint; askance; obliquely.