decern vs muddle up

decern

verb
  • transferred sense 

  • Decree a person etc. to be or to do something by judicial sentence.  (in the phrase “to decern in”, obsolete) To mulct in by decree of court. 

  • Decree by judicial sentence that something be done. 

  • intransitive 

  • with simple object 

  • See distinctly (with the eyes or the mind); distinguish (an object or fact); discern. 

muddle up

verb
  • to confuse (one or more objects with another object or other objects) 

  • To mix together 

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