down to vs up till

down to

prep
  • Due to. 

  • Next to; near; towards; as far as. 

  • Ready to (do something specified). 

  • With no one/nothing remaining but. 

  • Including even the smallest parts. 

up till

prep
  • Until. 

How often have the words down to and up till occurred in a corpus of books? (source: Google Ngram Viewer )