excuse vs unpen

excuse

verb
  • To allow to leave, or release from any obligation. 

  • To provide an excuse for; to explain, with the aim of alleviating guilt or negative judgement. 

  • To forgive; to pardon. 

  • To relieve of an imputation by apology or defense; to make apology for as not seriously evil; to ask pardon or indulgence for. 

noun
  • Explanation designed to avoid or alleviate guilt or negative judgment; a plea offered in extenuation of a fault. 

  • A defense to a criminal or civil charge wherein the accused party admits to doing acts for which legal consequences would normally be appropriate, but asserts that special circumstances relieve that party of culpability for having done those acts. 

  • An example of something that is substandard or of inferior quality. 

unpen

verb
  • To release from a pen. 

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