make out vs tumble to

make out

verb
  • To discern; to manage to see, hear etc. 

  • To manage, get along; to do (well, badly etc.). 

  • To draw up (a document etc.), to designate (a cheque) to a given recipient, payee. 

  • To represent; to make (something) appear to be true. 

  • To embrace and kiss passionately. 

  • To engage in heavy petting or sexual intercourse. 

tumble to

verb
  • To discover or understand something. 

How often have the words make out and tumble to occurred in a corpus of books? (source: Google Ngram Viewer )