The phrase "cracks the books" is an idiom used to describe studying or reading. The antonyms for this phrase could include "ignores the books," "skips the books," or "neglects the books." These antonyms would suggest a lack of interest or effort in learning, and can be used to describe someone who does not value education or knowledge. Other antonyms for "cracks the books" could include "forgets the books," "loses the books," or "abandons the books." Ultimately, these antonyms convey a sense of disinterest or indifference towards learning and can be used to describe someone who lacks motivation or dedication towards education.