of a dull greyish-brown colour

a dun cow

a dull greyish-brown colour

a horse with a sandy or sandy-grey coat, black mane, tail, and lower legs, and a dark dorsal stripe

a subadult mayfly, which has drab coloration and opaque wings

make persistent demands on (someone), especially for payment of a debt

after he left Oxford he was frequently dunned for his debts

a debt collector or an insistent creditor

a stone-built fortified settlement in Scotland or Ireland, of a kind built from the late Iron Age to the early Middle Ages. The word is a frequent place-name element in Scotland and Ireland