Crack a book phrase
The verb "crack" is used in the sense of the verb "open."
To study by opening a book and reading it. (usually used with a negative)
I'll have a test tomorrow, but I haven't cracked a book yet.
My friends were surprised when I told them that I had never cracked a book yet aced the tests.
The verb "crack" must be conjugated according to its tense.
This phrase dates from the early 1700s.
To start doing something enthusiastically and energetically
We have a lot of work to do today, so let’s get stuck in.