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add something up
to sum or total a set of figures. (See also add up (to something).) Please add these figures up again. I didn't add up these figures!
add up(to something)
1. Lit. [for a set of figures] to equal a total. These figures don't add up to the right total!
2. Fig. [for facts or explanations] to make sense. (Considering facts as if they were figures.) Your explanation just doesn't add up!
1. to be reasonable His story of what happened to him just doesn't add up.
Usage notes: usually used with not, as in the example
2. to increase in expense With five kids in the family, our medical bills really add up.
1. Amount to an expected or correct total, as in These figures don't add up, meaning they are not correct. [Mid-1800s]
2. Be consistent, make sense, as in I'm not sure that all this testimony will add up. [First half of 1900s]
3. Assess, form an opinion of, as in He looked across the track and added up the competition. Also see add up to.
1. To calculate a sum by adding some set of numbers: The students added up the numbers they had copied from the blackboard. If you add all the scores up, we'll find out who won.
2. To calculate something, especially by addition: The shopkeeper added up the day's profits.
3. To amount to an expected total: Unfortunately, when we put the numbers into the equation, they did not add up.
4. To be reasonable, plausible, or consistent; make sense: The jury did not believe the witness's testimony because it simply did not add up.