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check yourself into somewhere
to enter a hospital for medical care He had chest pains and checked himself into the hospital.
1. Investigate something, as in I don't know when they open but I'll check into it. Also see check out.
2. Register one's arrival at, as in She was about to check into the hospital. Also see check in, def. 1.
1. To investigate something; look into something: I checked into the rumor that the band was going on tour, and the rumor turned out to be false.
2. To register and gain admittance to one's room upon arrival at a hotel or other place of lodging: When I arrived in New York, I checked into the hotel and went straight to bed.