One of the mysteries of the English language finally explained.
Execution of a person before trial; (more widely) summary justice, arbitrary punishment. Compare earlier "Cupar justice".
Late 17th century. In some forms from the name of Jedburgh (in Scots also Jeddart, Jedhart, Jethart, † Jedworth, † Jedwood, etc.), a town in the Scottish Borders, where summary justice was said to have been meted out, perhaps with reference to the summary acts of pacification of the Borders carried out under King James VI + justice.
Jeddart justice/ˈdʒɛdət ˌdʒʌstɪs/
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