English Reference

Phrasal verb

check in

Definitions

01at a hotel or airport

A2 · Elementary

phr.v. to show your ticket or passport and get your room key or boarding pass.

phr.v. to register one's arrival at a hotel, airport, or clinic. Intransitive or transitive with 'at'.

“We need to check in at the hotel before we go out for dinner.”

“Passengers are advised to check in at least three hours before their international flight to allow sufficient time for security screenings.”

Synonyms

Antonyms

02to contact someone

B1 · Intermediate

phr.v. to talk to someone to see if they are okay or to tell them where you are.

phr.v. to make contact with someone to provide an update or to monitor their status. Often used with the preposition 'with'.

“I'll check in with you tomorrow morning to see how the project is going.”

“The social worker promised to check in with the family twice a week to ensure the recovery process was proceeding as planned.”

03computing

B2 · Upper Intermediate Computing Technical

phr.v. to save a new version of your work into a shared computer system.

phr.v. to commit or upload updated files to a central repository in a version control system.

“Don't forget to check in your code before you leave for the weekend.”

“The lead developer requested that all team members check in their final revisions by midnight to prepare for the morning deployment.”

Antonyms

04public transport

B1 · Intermediate

phr.v. to tap your travel card on a reader when you start a journey.

phr.v. to validate a smartcard or ticket at the start of a journey on public transport. Common in European contexts.

“You must check in with your card at the yellow post before getting on the train.”

“Commuters who fail to check in at the station entrance may be liable for a fine even if they possess a valid monthly pass.”

Synonyms

tap intouch in

Antonyms

Teaching tip

Contrast 'check in' (register arrival) with 'check out' (register departure) and 'check on' (inquire about someone's well-being).

Phrasal verb

Particles

in

Separability

separable

Pattern

check + (object) + in

Synonyms

Antonyms

Grammar

Domain

Computing

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.A2 KeyIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.3.0–4.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 2.0–2.524–43TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.225–549
Frequency
Very common
Level
A2 · ElementaryOxford
Updated

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English Reference