ANSWERS: 2
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from http://www.englishdaily626.com/slang.php?075 "Etymology: A 'sandwich' is an assortment of food between two pieces of bread, and 'knuckles' are the bones in your hand. So a 'knuckle sandwich' is a fist that goes straight toward your mouth."
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England - ah, sorry. You said "When", not where. My bad.
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