This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To importune (a debtor) for payment: a dunning letter.

n. One that duns.

n. An importunate demand for payment.

n. An almost neutral brownish gray to dull grayish brown.

n. A fishing fly having this color.

n. A horse of this color.

n. A brownish grey colour.

adj. Of a brownish grey colour.

n. A collector of debts.

v. To ask or beset a debtor for payment.

v. To harass by continually repeating e.g. a request.

n. A valley in the Himalayan foothills, e.g. Dehra Dun.

n. A newly hatched, immature mayfly.

v. Eye dialect spelling of done: simple past tense and past participle of do.

phrase. Eye dialect spelling of don't.

n. A mound or small hill.

v. To cure, as codfish, in a particular manner, by laying them, after salting, in a pile in a dark place, covered with salt grass or some like substance.

v. To ask or beset (e.g., a debtor), for payment; to urge importunately.

n. One who duns; a dunner.

n. An urgent request or demand of payment.

adj. Of a dark color; of a color partaking of a brown and black; of a dull brown color; swarthy.

Of a color partaking of brown and black; of a dull-brown color; swarthy.

Dark; gloomy.

n. A familiar name for an old horse or jade: used as a quasi-proper name (like dobbin).

To make of a dun or dull-brown color.

Especially To cure, as cod, in such a manner as to impart a dun or brown color. See dunfish.

To become of a dun color.

To make a loud noise; din.

To demand payment of a debt from; press or urge for payment or for fulfilment of an obligation of any kind.

n. One who duns; an importunate creditor, or an agent employed to collect debts.

n. A demand for the payment of a debt, especially a written one; a dunning-letter: as, to send one's debtor a dun.

n. A hill; a mound; a fortified eminence.

n. A dun-colored natural or artificial fly used in angling: as, the pale-olive dun, made with a body of hair from the polar bear; goose-dun, with a body of gray goose-pinion; blue dun, with a body of pale mole-fur.

v. treat cruelly

v. cure by salting

v. make a dun color

n. horse of a dull brownish grey color

adj. of a dull greyish brown to brownish grey color

n. a color or pigment varying around a light grey-brown color

v. persistently ask for overdue payment

"Since I've left you all in candy-coated withdrawal, I wanted to return with a thrilling post on * dun dun dun* …"

chromatic   

dunned    dunning    duns   

cure    darken    mount    saddle horse    riding horse    light brown    demand   

dun hackle    fallow-dun    mouse-dun    dun in the mire    durmast oak    bawn    Colours   

dunning    dunner    dunned    dunnest   

dunned    dunning    dun-bar    dun letter   

dunner    swarthy    drab    ask   

Donne    Gunn    Hon    Hun    Jun    Kun    M1    Nun    Son    Sun   

roan    sorrel    dappled    chestnut    snow-white    grey    tawny    tungkol    yellowish    piebald