After hours of questioning by the police, the suspect finally 'cracked'. [=finally told the police what they wanted to know]
The new restaurant 'is not all it's cracked up to be'. When we went, the service was awful and our food was cold.
Is the movie really 'all it's cracked up to be'? = Is it really 'as good as it's cracked up to be'?
(..) You're big boys. What about the baby? Just leave him in the car. We're only gonna be minutes. We're not leaving a baby in the car./ He'll be fine. I cracked the window. What if they don't remember us./ Well, let's just find out. Excuse me sir. Look at these guys. What happened? You missed me? (..)2009 The Hangover