check in

If you do this, you give your details when you arrive at a hotel or before a flight.

• We checked in at noon.
• Can I check in online for this flight?
• The guests are checking in at reception.

How to use it: check in at something (We checked in at the hotel after lunch.); check in for something (You can check in for your flight online.)

Similar words: register

Opposites: check out

Common phrases: check in online, check in early, check in at reception

If you do this, you record a guest’s arrival and check their details.

• I will check you in.
• The clerk checked in six guests before lunch.
• Could you check me in for the evening flight?

How to use it: check someone in (The receptionist checked us in quickly.)

Similar words: register

Common phrases: check someone in, check in guests, check in passengers

If you do this, you contact someone to tell them where you are or how things are going.

• Check in when you arrive.
• She checked in with her parents from the station.
• The team checks in by phone every Friday.

How to use it: check in with someone (Please check in with your manager every morning.)

Similar words: report, get in touch

Common phrases: check in with someone, check in by phone, check in every day

If you do this, you visit someone to see whether they are well or need help.

• I will check in tomorrow.
• She checked in on her grandfather after work.
• Our neighbor checks in every Sunday to see how we are.

How to use it: check in on someone (I checked in on my neighbor after her operation.)

Similar words: look in, visit

Common phrases: check in on someone, check in after work, check in tomorrow

If you do this, you return a borrowed item or save changed computer code in a shared system.

• Please check these books in.
• The developer checked in the updated code yesterday.
• Have you checked your changes in yet?

How to use it: check something in (Please check the books in before closing time.); check something in to something (She checked her changes in to the repository.)

Similar words: return, submit

Opposites: check out

Common phrases: check in books, check in code, check something in

A prisoner does this when they ask to stay alone in a cell to be safe from other prisoners.

• He checked in after receiving threats.
• Some prisoners check in because they fear gang violence.
• The inmate decided to check in rather than face his attackers.

Common phrases: check in for protection, check in voluntarily