1) Dice. Note that this sense is never used singularly - you never roll "a bone", you roll "the bones". Origin unclear - but I suspect it has something to do with certain voodoo in which a practicer would cast bones for fortune telling.
2) Monetary units, usually US dollars. Used for high numbers generally. Origin again unclear here, but possibly alludes to an arm and a leg.
2) Dude, that designer shirt is gonna cost you fifty bones.
Prices shown in USD.
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