hushing up vs misprision

hushing up

misprision

noun
  • Incorrect or unfair suspicion; (countable) an instance of this. 

  • Criminal neglect or wrongful execution of duty, especially by a public official; (countable) a specific instance of this. 

  • Misinterpretation or misunderstanding; (countable) an instance of this; a mistake. 

  • Not seeing the value in something; undervaluing. 

  • Despising or holding in contempt; disdain, scorn. 

  • In full misprision of felony or misprision of treason: originally, a less serious form of felony or treason; later, the crime of (intentionally) failing to give information about a felony or treason that one knows about; (countable) an instance of this. 

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