Plural of gibbet; multiple upright posts with extending arms used to hang executed criminals.
Regular plural formation from 'gibbet' (Old French 'gibet'), appearing in plural form in English texts from the 13th century onward.
Medieval towns and crossroads would literally be lined with multiple gibbets—one historical record mentions a 'Forest of Gibbets' outside Paris with dozens of decomposing criminals creating a grotesque skyline that criminals could see from miles away!
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