add up

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add up (third-person singular simple present adds up, present participle adding up, simple past and past participle added up)

  1. (transitive) To take a sum.
    Add up the prices and find out how much it will cost.
  2. (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.
  3. (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?