noun

• (uncountable) Manure; animal excrement.
  "Poor Tom, that eats the swimming frog, the toad, the todpole, the wall-newt, and the water; that in the fury of his heart, when the foul fiend rages, eats cow-dung for sallets; swallows the old rat and the ditch-dog; drinks the green mantle of the standing pool[…]"
• (countable) A type of manure, as from a particular species or type of animal.

verb

• (transitive) To fertilize with dung.
  "a cart he found, That carry'd compost forth to dung the ground"
• (transitive, calico printing) To immerse or steep, as calico, in a bath of hot water containing cow dung, done to remove the superfluous mordant.
• (intransitive) To release dung: to defecate.
  "[…] for hungry birds have devoured ſeeds, and having moiſtened and warmed them in their bellies, a little after have dunged in the forky twiſtes of Trees, and together with their dung excluded the ſeed whole which erſt they had ſwallowed: and ſometimes it brings forth there where they dung it, […]"

verb

• (obsolete) past participle of ding

verb

• (colloquial) To discard (especially rubbish); to chuck out.