unravel vs wear through

unravel

verb
  • To clear from complication or difficulty; to unfold; to solve. 

  • To separate the threads (of); disentangle. 

  • To become separated; (of something woven, knitted, etc.) to come apart. 

  • To separate the connected or united parts of; to throw into disorder; to confuse. 

  • To become undone; to collapse. 

wear through

verb
  • to use (something) too much so that a hole develops in it 

How often have the words unravel and wear through occurred in a corpus of books? (source: Google Ngram Viewer )