add up

verb

To take the sum of; to total. (transitive) · Add up the prices and find out how much it will cost.· When they added up the vaccine doses from all known and anticipate sources, they didn't have enough.
To accumulate; to amount to. (intransitive) · If you can save even a couple of dollars per day, it will add up to a lot over a year.
To make sense; to be reasonable or consistent. (intransitive) · His story just doesn't add up. Why would he have been at the restaurant the day before the event?

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From the library

A green roof costs considerably more to install than a conventional one, and the savings on energy and repairs take years to add up.

Gardens in the Sky, p. 1 · C2

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