E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
of Popes line, Slander or poison dread from Delias rage, was Lady Deloraine, who married W. Windam of Carsham, and died 1744. The person said to have been poisoned was Miss Mackenzie. (Satires and Epistles, i. 81.)
Delia is not better known to our yard-dogi.e. the person is so intimate and well known that the yard-dog will not bark at his approach. It is from Virgil, who makes his shepherd Monalcas boast That his sweetheart is as well known to his dog as Delia the shepherdess. (Eclogues, iii. 67.)