Emily Dickinson Lexicon

DUN, v.t.² [Sax. dynan, to clamor, to din. See Din. Qu. Gr. δονεω.]

1. Literally, to clamor for payment of a debt. Hence, to urge for payment; to demand a debt in a pressing manner; to urge for payment with importunity. But in common usage, dun is often used in a milder sense, and signifies to call for, or ask for payment.
2. To urge importunately, in a general sense, but not an elegant word.