Definition of "stack up"

stack up

verb
third-person singular simple present stacks up, present participle stacking up, simple past and past participle stacked up
1. (transitive) To put into a stack.
2. (intransitive) to pile up; to accumulate.
3. (idiomatic, transitive) To put a group of abstract things together.
4. Often followed by against or among: to compare with (something); to measure up.
  Quotations
  "How Populations Stack Up Among Nations At War" (name of the article)
  1939, Milwaukee Journal, issue of 7th September, page 3
  This is a great outline. Fantastic. If yours doesn't stack up, you won't get a chance to look at it.
  1973, The Paper Chase, 01:17:10
  [Raheem] Sterling's attitude and ability is never in doubt, never ducking a challenge or dropping his intensity, but the numbers are simply not stacking up at England level.
  2018 June 18, Phil McNulty, “Tunisia 1 – 2 England”, in BBC Sport‎, archived from the original on 21 April 2019
  Meaney said the rail industry needs to be honest with itself when discussing major investment projects, and to ask if the business case stacks up.
  2021 February 24, Richard Clinnick, “Decarbonisation key to retaining financial support”, in RAIL, number 925, page 18