O.E.
dung "manure," from PIE
*dhengh- "covering" (cf. Lith.
dengti "to cover," O.Ir.
dingim "I press"); the word recalls the ancient Gmc. custom (reported by Tacitus) of covering underground shelters with manure to keep in warmth in winter.
"The whole body of journeymen tailors is divided into two classes, denominated Flints and Dungs: the former work by the day and receive all equal wages; the latter work generally by the piece" [1824].