(A). A one-sided bargain. Alluding to the exchange of armour between Glaucos and Diomedes. As the armour of the Lycian was of gold, and that of the Greek of brass, it was like bartering precious stones for French paste. Moses, in Goldsmith's Vicar of Wakefield, made “a Glaucus' swop” with the spectacle-seller.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894