check into
Beginner (A2)neutral
To arrive at a hotel or hospital and officially say you are there, or to start finding out the facts about something.
"They checked into the mountain lodge just before dark and were shown to their room."
Hear it in context

Learn English While You Sleep | Everyday Advanced English Listening & Speaking Practice Podcast
English In Minutes · 66:37
You check into a hotel.

Why You Understand English but Still Can’t Speak Fluently | C1–C2 Practice
English Native Flow · 66:35
You check into a hotel.

PC Giveaway + Intel Core Ultra 200HX Plus Processors and Corsair 3200D Gaming PC Build
Intel Gaming · 54:10
I'll check into it.

PC Giveaway + Intel Core Ultra 200HX Plus Processors and Corsair 3200D Gaming PC Build
Intel Gaming · 54:11
Yeah, he'll check into it.

I Hunted Down Real Scammers!
Airrack · 21:59
Did you check into your room yet?