(chiefly US and Australia, informal, figuratively) To study, especially with particular intensity.

The first five books of the Hebrew Bible.

plural of address book

plural of funny book

plural of joke book

(idiomatic) To manipulate accounting information, especially illegally. / (idiomatic, by extension) To falsify an account of an event.

plural of poll book

plural of prayer book

plural of guide book

(colloquial, with regard to income) Undeclared for tax and social insurance etc.