luck out vs rack up

luck out

verb
  • To experience great luck; to be extremely fortunate or lucky. 

  • To be unfortunate or unlucky; to run out of luck. 

rack up

verb
  • to acquire, to gather together. 

  • to arrange in a rack 

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

  • to defeat severely, to thrash 

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