Book in Meaning in English
expression
Definition
To register your arrival at a place, such as a hotel, airport, or event, usually by giving your name and details.
Usage & Nuances
Primarily British English; often used at hotels, hostels, or events for the registration step. American English usually uses 'check in.' Can be used literally ('book in at reception') or with people ('We'll book you in for 2 PM'). Not related to reserving in advance ('book').
Example Sentences
You need to book in at the front desk when you arrive.
basic
All guests must book in before using the swimming pool.
basic
Please book in at this counter for your appointment.
basic
I forgot to book in at the hostel and had to wait outside.
natural
If you book in late, your room might be given away.
natural
They'll book you in for a checkup as soon as possible.
natural