12 vs plod

12

noun
  • Collectively, police or law enforcement. 

  • See also: fuck 12 

symbol
  • Used by fans of American football, positioning themselves as the 12th member of an 11-player team. 

plod

noun
  • the police, police officers 

  • A slow or labored walk or other motion or activity. 

  • a police officer, especially a low-ranking one. 

verb
  • To walk or move slowly and heavily or laboriously (+ on, through, over). 

  • To toil; to drudge; especially, to study laboriously and patiently. 

  • To trudge over or through. 

How often have the words 12 and plod occurred in a corpus of books? (source: Google Ngram Viewer )