Brooch

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Middle English: variant of broach, a noun originally meaning ‘skewer, bodkin’, from Old French broche ‘spit for roasting’, based on Latin brocchus, broccus ‘projecting’. Compare with broach1.

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Variant of broach.

etymonline

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brooch (n.)

"ornamental clasp consisting of a pin and a covering shield," early 13c., from Old French broche "long needle" (see broach (n.)). Specialized meaning led 14c. to distinct spelling.