fore vs on the line

fore

adj
  • Forward; situated towards the front (of something). 

noun
  • The front; the forward part of something; the foreground. 

intj
  • An exclamation yelled to inform players a ball is moving in their direction. 

adv
  • In or towards the bows of a ship. 

  • In the part that precedes or goes first; opposed to aft, after, back, behind, etc. 

on the line

prep
  • At risk, as in a contest or enterprise. 

  • Currently calling on the telephone. 

  • On one of the lines marked on a playing field or court; (by extension) within bounds. 

  • On a level with the eye of the observer, as of a picture hung in on a wall. 

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