airman vs flatfoot

airman

noun
  • A naval seaman, especially one in the U.S. Navy, who works on and/or handles aircraft. 

  • A pilot of an aircraft. 

  • A member of an air force. 

  • A person of a rank in the U.S. Air Force above airman basic and below airman first class. 

flatfoot

noun
  • A sailor. 

  • A condition in which the arch of the foot makes contact with the ground. 

  • A person having the above condition. 

verb
  • To wrong-foot. 

  • To perform an action inefficiently or awkwardly. 

  • To gulp an entire drink (bottle, glass, can, etc.) without pausing between swallows. 

  • To walk around in the course of work, especially when investigating. 

  • To dance in the style of Appalachian clogging. 

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