GNU Collaborative International Dictionary of English

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1.       
   Dun (dŭn), v. t. & i. [imp. & p. p. Dunned (dŭnd); p. pr. & vb. n. Dunning (dŭnˈnĭng).] [AS. dyne noise, dynian to make a noise, or fr. Icel. dynr, duna, noise, thunder, duna to thunder; the same word as E. din. √74.  See Din.] To ask or beset (e.g., a debtor), for payment; to urge importunately.
   
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   Hath she sent so soon to dun? Swift.
   
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