not saying boo vs whist

not saying boo

whist

adj
  • Silent, hushed. 

noun
  • Any of several four-player card games, similar to bridge. 

  • A session of playing this card game. 

verb
  • To hush, shush, or whisht; to still. 

  • To become silent. 

How often have the words not saying boo and whist occurred in a corpus of books? (source: Google Ngram Viewer )