add up
Pronunciation:
verb
Definitions
To take a sum.
Example: Add up the prices and find out how much it will cost.
To accumulate; to amount to.
Example: 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.
Example: His story just doesn't add up. Why would he have been at the restaurant the day before the event?