clasp locker vs zipper

clasp locker

zipper

verb
  • to put a zipper on an article. 

  • to close a zipper. 

noun
  • A string of clothes pegs or clips attached to the body and then quickly pulled off. 

  • A pressure-sensitive plastic closure. 

  • A leucine zipper. 

  • A zip fastener. 

  • A technique for arbitrarily traversing an aggregate data structure and updating its contents. See zipper (data structure). 

  • A scar on a person's body. 

How often have the words clasp locker and zipper occurred in a corpus of books? (source: Google Ngram Viewer )