embroil vs untangle

embroil

verb
  • To implicate in confusion; to complicate; to jumble. 

  • To draw into a situation; to cause to be involved. 

untangle

verb
  • To remove confusion or mystery from. 

  • To remove tangles or knots from. 

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