glancing-glassn.Scottish ‘a glass used by children for reflecting the rays of the sun on any object’ (Jamieson). In quots. figurative.
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1728 P. WalkerSome Remarkable Passages Life A. Peden (ed. 3) 95 A glazing Glancing-glass, who loves to hear himself speak, and the World to notice him.
1818 W. ScottHeart of Mid-Lothian xi, in Tales of my Landlord 2nd Ser. I. 320 Gazing, glancing-glasses they are, fit only to fling the glaiks in folks een.