shade of dun
collocation灰褐色；一种灰褐色色调
The moth’s wings are a shade of dun that blends with the tree bark.
这种蛾的翅膀呈灰褐色，能与树皮融为一体。
灰褐色；暗褐色
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灰褐色；暗褐色
A brownish grey or dull brown colour.
The farmer's favorite horse was a sturdy dun.
这位农民最喜欢的马是一匹结实的暗褐色马。
棕灰色
A brownish grey colour.
催债者,尤其是坚持和苛求的
A collector of debts, especially one who is insistent and demanding.
刚孵化的未成熟蜉蝣；蜉蝣亚成虫
A newly hatched, immature mayfly; a mayfly subimago.
古代或中世纪的防御工事,尤其是苏格兰或爱尔兰的山堡
An ancient or medieval fortification; especially a hill-fort in Scotland or Ireland.
She chose a soft dun for the walls of her study.
她为书房墙壁选择了一种柔和的暗褐色。
In the meadow, several duns grazed peacefully.
草地上，几匹暗褐色的马安详地吃草。
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灰褐色；一种灰褐色色调
The moth’s wings are a shade of dun that blends with the tree bark.
这种蛾的翅膀呈灰褐色，能与树皮融为一体。
收到催款通知
After months of unpaid rent, he received a dun from the landlord.
拖欠房租数月后，他收到了房东的催款通知。
发出催款通知
The supplier said she would send a dun if the invoice remained unpaid.
供应商说，如果发票仍未付款，她就会发出催款通知。
正在孵化的蜉蝣（亚成虫）
Trout began feeding on the hatching duns that drifted downstream.
鳟鱼开始捕食顺流漂下的刚孵化的蜉蝣。
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记忆联想：讨债人（dun）脸色灰褐（dun），总是一脸阴沉地催款。
语域：mixed 常见场景：colour description、debt collection (formal)、entomology / fly fishing、historical or archaeological text dun 作名词时有多个义项，语域不完全相同：表示“灰褐色”时通常用于日常颜色描写；表示“讨债人”或“催款要求”多用于正式或书面语境；表示“蜉蝣亚成虫”或“古堡/山丘”则比较常见于专业或历史语境。实际使用中需根据上下文判断。
常指暗褐色的马
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.