anguish vs unstring

anguish

verb
  • To cause to suffer pain. 

  • To suffer pain. 

noun
  • Extreme pain, either of body or mind; excruciating distress. 

unstring

verb
  • To shake the nerves of; to cause anxiety or panic in. 

  • To defuse or relax. 

  • To untie. 

  • To remove from a string; to release something that has been strung up or strung together. 

  • To split (a text string) into smaller strings by separating on a delimiter. 

  • To remove the string or strings from. 

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