bash vs knock for a loop

bash

verb
  • To criticize harshly. 

  • To strike heavily. 

  • To collide; used with into or together. 

noun
  • An attempt at doing something. 

  • A forceful blow or impact. 

  • A large party; a gala event. 

knock for a loop

verb
  • To astonish; to stagger or overwhelm; to confuse or disorient. 

How often have the words bash and knock for a loop occurred in a corpus of books? (source: Google Ngram Viewer )