Add-up Definition
verb
To take a sum.
Add up the prices and find out how much it will cost.
Wiktionary
(intransitive) To accumulate; to amount to.
If you can save even a couple of dollars per day, it will add up to a lot over a year.
Wiktionary
(idiomatic, intransitive) To make sense; to be reasonable or consistent.
His story just doesn't add up. Why would he have been at the restaurant the day before the event?
Wiktionary
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