accommodation ladder vs corridor

accommodation ladder

noun
  • a flight of stairs or a ladder for lowering over the side of a ship for access to and from a small boat. 

  • The property ladder, without the implication of necessarily owning the place where one lives. 

corridor

noun
  • A narrow hall or passage with rooms leading off it, as in a building or in a railway carriage. 

  • Airspace restricted for the passage of aircraft. 

  • The covered way lying round the whole compass of the fortifications of a place. 

  • The land near an important road, river, railway line 

  • A restricted tract of land that allows passage between two places. 

How often have the words accommodation ladder and corridor occurred in a corpus of books? (source: Google Ngram Viewer )