knock down vs whank

knock down

verb
  • To demolish. 

  • To drink fast. 

  • To disassemble for shipment. 

  • To reduce the price of. 

  • To hit or knock (something or someone), intentionally or accidentally, so that it falls. 

  • To approve a drinking toast by banging glasses on the table. 

  • At an auction, to declare (something) sold with a blow from the gavel. 

whank

verb
  • To cut, especially to cut off a large portion. 

  • To beat; to thrash; to whip; to lash. 

noun
  • A strike with the fist; a blow; a knock. 

  • A large portion, slice or lump. 

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