The term 'CRACK THE ___' can be completed with the words 'CHAP' and 'READ'. The phrase 'crack the CHAP' is an idiom that means to solve a difficult problem or puzzle. It is derived from the word 'CHAPTER', which is a section of a book, and the phrase 'READ between the lines', which means to look for hidden meanings in something. The phrase 'crack the READ' is similar in meaning, but it is more often used to refer to deciphering a code or breaking into a secure system.