v. 催债；不断烦扰；（使）成灰兔褐色（dun的现在分词）

Dun \Dun\ (d[u^]n), v. t. & i. [imp. & p. p. {Dunned} (d[u^]nd);
p. pr. & vb. n. {Dunning} (d[u^]n"n[i^]ng).] [AS. dyne noise,
dynian to make a noise, or fr. Icel. dynr, duna, noise,
thunder, duna to thunder; the same word as E. din. [root]74.
See {Din}.]
To ask or beset (e.g., a debtor), for payment; to urge
importunately.

Hath she sent so soon to dun? --Swift.