Dunning - definition of dunning by The Free Dictionary
https://www.thefreedictionary.com/dunning
vb, duns, dunning or dunned (Banking & Finance) ( tr) to press or importune (a debtor) for the payment of a debt n 1. (Professions) a person, esp a hired agent, who importunes another for the payment of a debt 2. (Banking & Finance) a demand for payment, esp one in writing [C17: of unknown origin] dun ( dʌn) n 1. (Colours) a brownish-grey colour 2.
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