To officially tell someone you have arrived at a hotel, airport, or event, usually by giving your details.
Examples
We need to check in at the hotel before 3 p.m.
A: What time do we check in for our flight?
B: Usually two hours before departure.
Common mistake
Not: We checked in the hotel at noon.
Say: We checked into the hotel at noon. / We checked in at the hotel at noon.
'Check INTO / check IN AT' a place — bare 'check in the hotel' is wrong.
More on “check in”Another example · Tell it apart · Goes with · Tip
Another example
When I travel for business, I always check in online to save time at the airport.
Tell it apart
We checked in at 2pm.
We checked out at 11am.
Goes with
- check in (at/into)