add up vs hold water

add up

verb
  • To make sense; to be reasonable or consistent. 

  • To take the sum of; to total. 

  • To accumulate; to amount to. 

hold water

verb
  • To withstand scrutiny or criticism; to be valid. 

  • Used other than figuratively or idiomatically: see hold, water. 

How often have the words add up and hold water occurred in a corpus of books? (source: Google Ngram Viewer )