verb

1. To take a sum.

   “Add up the prices and find out how much it will cost.”

2. 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.”

3. 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?”

Synonyms: accrue, mount up, compute, hang together, sum up, tally