overcrowd vs pass up

overcrowd

verb
  • To fill beyond reasonable limits, with people, animals, objects or information. 

pass up

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

  • To refuse (not accept); forgo. 

  • To submit (hand in) items to a person, usually one's teacher. 

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