Past tense: executed or put to death by guillotine; figuratively, to cut off abruptly or eliminate something.
From guillotine (the execution device named after Joseph Guillotin, 1738-1814) + -ed past tense suffix. During the French Revolution, this became the standard verb for judicial execution.
Ironically, Dr. Joseph Guillotin advocated for the guillotine because he thought it was more humane than other execution methods—it was supposed to be a progressive reform, showing how even good intentions can become associated with tragedy.
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