chug vs knock back

chug

verb
  • To drink a large amount (especially of beer) in a single action/without breathing; to chugalug. Usually chanted at the person who is drinking. 

  • To solicit charitable donations on the street, particularly in a persistent manner. 

  • To move or travel at a steady, although not especially fast, pace. 

  • To make dull explosive sounds. 

  • To move or travel whilst making such sounds. 

noun
  • A large gulp of drink. 

  • A dull, fairly quick explosive or percussive sound, as if made by a labouring engine. 

  • A person of Native American descent. 

  • A homemade Cuban boat, built to carry emigrants to the USA, and often abandoned upon arrival. 

  • A dog that is a cross between a pug and a chihuahua. 

knock back

verb
  • To drink an alcoholic beverage swiftly or often. 

  • To stun; to surprise. 

  • To press or knead (dough) so as to remove air bubbles. 

  • To reject; to refuse. 

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