run away vs run down

run away

verb
  • To flee by running. 

  • To leave home, or other place of residence, usually unannounced, or to make good on a threat, with such action usually performed by a child or juvenile. 

  • To become a runaway. 

run down

verb
  • 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. 

  • To criticize someone or an organisation, often unfairly. 

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