The phrase "an arm and a leg" typically means something is very expensive or costs a lot. Picture it like this: if something costs an arm and a leg, it's so pricey you might have to sell your own limbs to afford it! This expression likely emerged in America after World War II, and it has been a useful idiom in illustrating great sacrifice in pursuit of a goal. Imagine buying a house for example, it's a gigantic investment that could metaphorically cost you an arm and a leg. It just goes to show, when you're counting the cost, always make sure both your legs and arms are still attached!
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