butcher's mourning en · NOUN
Meanings
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(UK, obsolete, slang, uncountable) A white hat with a black mourning hatband.
Hats off, down there, you in the white hat and crape — you in the butcher's mourning — bonnet him — silence! Yes, says the Brahmin, the ceremony is about to begin; the national games are about to commence.
1855, William Calcraft, The Groans of the Gallows, page 13: