What is an example sentence with the idiom book at

The idiom "book at" is not a common idiom in English. It's possible that you're thinking of a different idiom, or you're using a phrase that is grammatically correct but not commonly used.

If you could provide more context or the full phrase you're interested in, I can help you understand the meaning and usage.

For example, you might be thinking of:

* "Book into": This idiom means to make a reservation, like "I booked into a hotel room for the weekend."

* "Book up": This idiom means to become fully booked, like "The restaurant was completely booked up for Saturday night."

Please give me more information so I can assist you!