Definify.com

Webster 1913 Edition

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Adj.

Having a gilt edge;

as,

gilt-edged

paper

Of the best quality; – said of negotiable paper, etc.

[Slang, U. S.]

gilt-edged ‎(not comparable)

(of pages of a book etc) Having gilded edges.
(of securities) Issued by the Bank of England.
Of the highest quality.
- 2011 January 15, Sam Sheringham, “Chelsea 2 -03 Blackburn Rovers”, in BBC:
  Then a disastrous back-pass from Christopher Samba presented Drogba with a gilt-edged chance but the Ivorian's shot was saved by Robinson with his legs.