Basic Guidelines For English Spellings
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That is a yellowish shade of dun.
1A yellowish shade of dun.
2Fishing
A yellow mayfly, especially Heptagenia sulphurea; an artificial fly made in imitation of this.
3A horse of a yellowish dun colour.
Late 16th century; earliest use found in George Gifford (d. 1600), Church of England clergyman and author. From yellow + dun.