Hanged on a gibbet; executed and displayed as a warning; or the past tense of 'gibbet' used as a verb.
From the verb form of 'gibbet,' adding the past-tense suffix '-ed.' Became common in English historical texts describing judicial punishments.
In English legal records, famous criminals were 'gibbeted in chains' for years after death—their bodies would decay while still hanging as a permanent scarecrow for crime, which is why 'gibbet' became synonymous with shame and infamy.
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