battle vs mix it up

battle

verb
  • To fight or struggle; to enter into a battle with. 

  • To render (land, soil, etc.) fertile or fruitful. 

  • To feed or nourish (someone or something). 

  • To join in battle; to contend in fight 

adj
  • Improving; nutritious; fattening. 

  • Fertile; fruitful. 

noun
  • A contest, a struggle. 

  • A general action, fight, or encounter, in which all the divisions of an army are or may be engaged; a combat, an engagement. 

  • battle buddy 

mix it up

verb
  • To compete vigorously, to quarrel, or to fight physically. 

  • To create one or more variations of the usual way in which something is done. 

  • To engage with people, relate to people. 

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