pass over vs slip through the cracks

pass over

verb
  • To overlook; not to note or resent. 

  • Used other than figuratively or idiomatically: see pass, over. 

  • To make a transit of; to pass through or across (something). 

  • To bypass or disregard in favour of someone or something else. 

  • To bypass (something); to skip (something). 

  • To die and thus progress to the afterlife. 

slip through the cracks

verb
  • To escape notice or lack sufficient attention. 

How often have the words pass over and slip through the cracks occurred in a corpus of books? (source: Google Ngram Viewer )