check into

US /tʃek ˈɪntuː/

UK /tʃek ˈɪntuː/

1.

to register at a hotel or airport

:

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We need to check into the hotel before 3 PM.

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Passengers are advised to check into their flights at least two hours before departure.

:

register sign in book in

2.

to investigate or examine something

:

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The police are checking into the suspicious activity.

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I need to check into why the system crashed.

:

investigate look into examine probe research

:

check checked check in check on check out check-up health check