check in

check in

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.
See also: check
Farlex Dictionary of Idioms.

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.
See also: check

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.
See also: check

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.
See also: check

check in

(at something) to go to a place to record one's arrival. When you get there, check in at the front office.
See also: check

check in

(on someone or something) Go to look in (on someone or something).
See also: check

check in

(with someone) to go to someone and indicate that one has arrived some place. Please check in with the desk clerk.
See also: check
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

check in

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.
See also: check
The American Heritage® Dictionary of Idioms by Christine Ammer.

check in

v.
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.
See also: check
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • at (one's) doorstep
  • at doorstep
  • a change of scenery
  • a change of scene
  • (from) top to toe
  • at (one's) expense
  • at expense
  • at somebody's expense
  • at someone's expense
  • be remembered as (something)
References in periodicals archive
You can use the network to engage increasingly mobile customers with "specials," which are discounts and prizes offered to loyal customers when they check in on Foursquare at your venue.
Thanks to the Internet, many airline passengers are already familiar with using their home or office computers to check in and print a boarding pass--two convenient locations far removed from the traditional ticket counter.
And to help further cut the cost of flights, Ryanair may even start charging passengers for the luggage they check in.
To help passengers move through the airport as quickly as possible, passengers may use http://www.delta.com to purchase tickets and check in virtually, and should arrive early, use curbside check-ins or self-service kiosks, bring proper identification, check baggage restrictions, and produce a boarding pass or e-ticket receipt.
The OneStop Self-Service check-ins allow the airline's customers who are travelling domestically on an electronic ticket to check in, select a seat, obtain a boarding pass and check in luggage at any of the eight kiosks located on the terminal's south side.
The new 'Top 10 Destinations' app, built by Facebook preferred marketing developer Betapond, features a leaderboard of the most popular travel destinations in the world using the 'Were Here' API to access Facebook's huge bank of location-based data on check ins, tagged people, photos and albums.