cloister vs curtain off

cloister

verb
  • To protect or isolate. 

  • To confine in a cloister, voluntarily or not. 

  • To become a Roman Catholic religious. 

  • To deliberately withdraw from worldly things. 

  • To provide with a cloister or cloisters. 

noun
  • such an arcade in a monastery; 

  • A place, especially a monastery or convent, devoted to religious seclusion. 

  • The monastic life. 

  • such an arcade fitted with representations of the stages of Christ's Passion. 

curtain off

verb
  • To isolate. 

  • To separate, isolate or block by means of a curtain or other barrier. 

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