To kill someone or to turn something off; also means to remove or eliminate.
From Old English 'of' or 'off' meaning away or down. Used as a verb by the early 20th century, particularly in slang meaning 'to kill,' though it can mean simply 'to switch off.'
This word shows how English adapts the same word for totally different meanings—'off' as a direction, 'off' as finished, and 'off' as to kill—based on context alone!
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