acquire vs rack up

acquire

verb
  • To gain, usually by one's own exertions; to get as one's own 

  • To sample signals and convert them into digital values. 

  • To contract. 

  • To get. 

rack up

verb
  • to gain (points etc.; in a game or sport), to accumulate 

  • to arrange in a rack 

  • to acquire, to gather together. 

  • to defeat severely, to thrash 

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