debit vs knock off

debit

verb
  • To record a receivable in the bookkeeping. 

  • To make an entry on the debit side of an account. 

adj
  • of or relating to process of taking money from an account 

  • of or relating to the debit card function of a debit card rather than its often available credit card function 

noun
  • In bookkeeping, an entry in the left hand column of an account. 

  • A sum of money taken out of a bank account. Thus called, because in bank's bookkeeping a cash withdrawal diminishes the amount of money held on the account, i.e. bank's debt to the customer. 

knock off

verb
  • To make a copy of, as of a design. 

  • To rob. 

  • To defeat. 

  • To halt one's work or other activity. 

  • To have sex with. 

  • To remove, as a discount or estimate. 

  • To assign (an item) to a bidder at an auction, indicated by knocking on the counter. 

  • To remove by hitting (something, someone) 

  • To kill. 

  • To accomplish hastily. 

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