check in

US /tʃek ɪn/
UK /tʃek ɪn/
"check in" picture
1.

办理入住, 报到

to register one's arrival at a hotel, airport, or other venue

:
We need to check in at the hotel before 3 PM.
我们必须在下午3点前在酒店办理入住
Passengers should check in two hours before their flight.
乘客应在航班起飞前两小时办理登机手续
2.

联系, 报平安

to make contact with someone, usually to report or get information

:
I'll check in with you later to see how it's going.
我稍后会联系你,看看进展如何。
She always checks in with her parents when she travels.
她旅行时总是父母报平安