I know the meaning, just want to know the origin, Thanks!:-)
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I've been looking into this myself, and though I can't find anything 'official' (seems we are the only ones interested, apparently). It would seem that the term comes from the literal meaning. In the day a butcher's bill would consist of the types of cuts, portions and other services typically performed by a butcher. I can't find the initial point when it was used, but it was popular with police investigators on early american TV dramas.
Yes apparently the origin is from the Napoleonic Wars a la Lord Nelson. Referred to in And the Band Played On when referring to the number dead in the early days of the AIDS epidemic.
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The term "Butcher's bill" is a reference to the fact that ships, as well as small towns, often had lousy doctors (surgeons), if any. Many amputations were performed in battle (butchering), so the surgeon was referred to as a "butcher". Hence, loss of life and other casualties would be referred to as the "butcher's bill".

I heard it mentioned in a movie entitled “And the Band Played On” about the early AIDS crisis. I thought the person in the movie said it was from Napoleon during the French Revolution.