milk jug vs tract of land

milk jug

noun

  • A woman's breast. 

  • A jug for holding milk. 

tract of land

noun

  • A woman's breast. 

  • Used other than figuratively or idiomatically: see tract, of, land. 

How often have the words milk jug and tract of land occurred in a corpus of books? (source: Google Ngram Viewer )