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1. To officially confirm one's arrival at a certain place where one is expected, such as a hotel. I'll go check in at the front desk and get our room key. Tara is checking in for the exam at the registration table.
2. To officially record someone's or something's arrival at a certain place. In this usage, a noun or pronoun can be used between "check" and "in." Sir, I can check you in over here. We need to check in all these students before they're given the test materials. The librarian already checked those books in.
3. To communicate with someone at a certain interval in time so as to provide or ask about an update in status or otherwise simply talk. Hi mom, I'm just checking in to see if you're feeling any better. Has anyone checked in with the publisher? When will the next issue be finished? Hey, check in with your mother once in a while when you're away at college, will you?
4. To die. That rickety old car will definitely check in before you make it to the mechanic.
check someone in
to record the arrival of someone. Ask the guard to check you in when you get there. Tell the guard to check in the visitors as they arrive.
check something in
1. to record that someone has returned something. I asked the librarian to check the book in for me. Did the librarian check in the book?
2. to take something to a place, return it, and make sure that its return has been recorded. I checked the book in on time. Did you really check in the book on time?
3. to examine a shipment or an order received and make certain that everything ordered was received. I checked the order in and sent a report to the manager. Tim checked in the order from the supplier to make sure that everything was there.
check in(to something)
1. to sign oneself into a place to stay, such as a hotel, hospital, motel, etc. She checked into a private hospital for some kind of treatment. They checked into the first motel they came to on the highway.
2. Go to look into something.
(at something) to go to a place to record one's arrival. When you get there, check in at the front office.
(on someone or something) Go to look in (on someone or something).
(with someone) to go to someone and indicate that one has arrived some place. Please check in with the desk clerk.
1. Record one's arrival at a hotel, conference, or other function, as in I asked the hotel if we could check in early. [Early 1900s] Also see check into, def. 2.
2. Die, as in With the plane rapidly losing fuel, the pilot was sure he'd check in. [Slang; early 1900s] Also see check out.
1. To register or record one's arrival somewhere, as at a hotel or airport: The airline requires you to check in at least an hour before your flight. I entered the hotel, went to the registration desk, and checked in.
2. To register or record the arrival of someone, as at a hotel or airport: The hotel receptionist checked us in and gave us the key to our room. The ticket agent checked in the passengers and gave them their boarding passes.
3. To return or deposit something somewhere, and have its receipt recorded: I checked the book in to the library a few days late. When we arrived at the airport, we checked in our luggage and proceeded to the plane.
4. To record that something has been returned or deposited somewhere: The librarian checked in the stack of books that people had returned. The porter checked our bags in for the flight.