knock cold vs slog

knock cold

slog

verb
  • To strike something with a heavy blow, especially a ball with a bat. 

  • To work slowly and deliberately at a tedious task. 

  • To walk slowly, encountering resistance. 

noun
  • A long, tedious walk, or session of work. 

  • An aggressive shot played with little skill. 

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