Pitch Perfect 2

Last weekend I saw Pitch Perfect 2. It was very hyped and I'm not sure it lived up to it's expectations, but after all it was funny. It's one of those movies you see on a Sunday afternoon just to have a laugh. The phrase they used I didn't understand was crack a book. It means open a book to study.

Dictionary: http://idioms.thefreedictionary.com/crack+a+book