for it vs up against it

for it

prep
  • Facing punishment for a misdeed. 

  • In order to attain some implied goal. 

  • Corresponding in volume. 

  • Used other than figuratively or idiomatically: see for, it. 

up against it

prep
  • In a very difficult position. 

How often have the words for it and up against it occurred in a corpus of books? (source: Google Ngram Viewer )