uncase vs unloosen

uncase

verb
  • To strip (someone); to undress. 

  • To display, or spread to view, as a flag, or the colors of a military body. 

  • To take out of a case or covering; to uncover. 

unloosen

verb
  • To unloose; to loosen. 

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