it's used for instance when someone is calculating everything they have bought in a certain time, or how much money it actually takes to do something like a project. It doesn't mean the prices are going up, it just means that when added all together the final total amount is getting higher and higher
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khah What does ‘‘add up’’ mean? Does it mean that things are getting more expensive/are increasing?Not exactly. It means that there are more things on which money must be spent than was originally thought to be the case.