knock vs run down

knock

verb
  • To criticize verbally; to denigrate; to undervalue. 

  • To kick a ball towards another player; to pass. 

  • To rap one's knuckles against something, especially wood. 

noun
  • An abrupt rapping sound, as from an impact of a hard object against wood. 

  • A sharp impact. 

  • A batsman's innings. 

  • A blow or setback. 

  • Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it. 

  • Synonym of hunger knock 

  • A criticism. 

run down

verb
  • To criticize someone or an organisation, often unfairly. 

  • To chase till the object pursued is captured or exhausted. 

  • To describe in the form of a rundown, a rough outline or summary. 

  • To reduce the size or stock levels of a business, often with a view to closure. 

  • To run against and sink, as a vessel. 

  • To read quickly a list or other short text. 

  • To find something or someone after searching for a long time. 

  • To lose power slowly. Used for a machine, battery, or other powered device. 

  • To decline in quality or condition. 

  • To crush; to overthrow; to overbear. 

  • To hit someone with a car or other vehicle and injure or kill them. 

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