Re: First time that expression actually made sense One myth is that the phrase comes from portrait painters charging more for paintings that include more of the subject's body in them. Head and shoulders is cheapest; then one with the arms in; and then the whole body. It's a fun theory but I reckon it's a myth as I don't see why "arm and a leg" would come out of this. If the saying was "It'll cost you a pair of legs" then I think it would make more sense.
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