brine vs keep up

brine

verb
  • To preserve food in a salt solution. 

  • To prepare and flavor food (especially meat) for cooking by soaking in a salt solution. 

noun
  • The sea or ocean; the water of the sea. 

  • Salt water; water saturated or strongly impregnated with salt; a salt-and-water solution for pickling. 

keep up

verb
  • To maintain; to preserve; to prevent from deteriorating. 

  • To continue with (work, etc). 

  • To stay even or ahead. 

  • To ensure that one remains well-informed about something. 

  • To prevent someone from going to bed or to sleep 

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