What does check in mean in this sentence?

[Mephistopheles]

English Language Tests, Intermediate level

ESL/EFL Test #775 "Vocabulary Practice: Going by Plane (1)", question 1

When you arrive at the airport, you have to ......... in at the airline desk.

(a) take
(b) check
(c) blow
(d) shock

English Language Tests, Intermediate level

ESL/EFL Test #775 "Vocabulary Practice: Going by Plane (1)", answer 1

When you arrive at the airport, you have to check in at the airline desk.

Correct answer: (b) check
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What does check in mean in this sentence.

[Alan]

Hi,

'Check in' in this sentence means that you have to report to the reception desk, show your ticket and hand in your luggage.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Mephistopheles]

Thx.