add up

verb — 3 senses

add up

verb

1

Of a numerical amount To take the sum of; to total.

Add up the prices and find out how much it will cost.
When they added up the vaccine doses from all known and anticipate sources, they didn't have enough.

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.
It all keeps adding up / I think I'm cracking up / Am I just paranoid? / Or am I just stoned?1994, Green Day, “Basket Case”, in Dookie:

1 more example

The bus wound its way up into San Marino, passing through the various small castellos that add up to form the diminutive country, […]2016, Christopher Walker, The First 49:

3

Idiomatic 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?
Phoenix: (Hmm... Something just isn't adding up here. I wonder, who they really saw?)2007 March 16, Capcom Production Studio 4, Phoenix Wright: Ace Attorney – Justice for All, Europe: Capcom, →OCLC, Nintendo DS, scene: Part 3: Investigation, Circus Entrance, level/area: Turnabout Big Top:

Synonyms: add, add together, add up, cast, count up, foot up, reckon up, sum, sum up, summate, tally, tally up, tot, tot up, total, tote, tote up
Antonyms: subtract
Hypernyms: calculate
Holonyms: arithmetic

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.