battle vs tune-up

battle

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 

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

  • To feed or nourish (someone or something). 

  • To join in battle; to contend in fight 

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

adj
  • Improving; nutritious; fattening. 

  • Fertile; fruitful. 

tune-up

noun
  • A match or race (frequently one exhibition in nature) contested as preparation for a match or race of high stakes. 

  • A series of adjustments to an engine in order to improve its performance 

  • A series of preparations for vigorous exercise; a warm-up 

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