city wall vs shut

city wall

noun
  • A wall around a city, built to define the city's boundaries, and sometimes to protect it from aggressors. 

shut

noun
  • A narrow alley or passage acting as a short cut through the buildings between two streets. 

  • The act or time of shutting; close. 

  • The line or place where two pieces of metal are welded together. 

  • A door or cover; a shutter. 

verb
  • To confine in an enclosed area. 

  • To catch or snag in the act of shutting something. 

  • To preclude; to exclude; to bar out. 

  • To close, to stop being open. 

  • To close, to stop from being open. 

  • To close a business temporarily, or (of a business) to be closed. 

adj
  • Closed; not open. 

How often have the words city wall and shut occurred in a corpus of books? (source: Google Ngram Viewer )