knock on the head vs rescind

knock on the head

verb
  • To put an end to; to defeat or frustrate (a scheme or project). 

rescind

verb
  • To cut away or off. 

  • To repeal, annul, or declare void; to take (something such as a rule or contract) out of effect. 

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