Definitions:
of a dull greyish-brown colour

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

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.