check into

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check into

1. To officially confirm one's arrival at a certain place where one is expected, such as a hotel. I'll check into the hotel and get our room key. Where do we check into the conference?
2. To voluntarily seek medical care at the hospital (as opposed to being rushed there by ambulance). In this usage, a reflexive pronoun is used between "check" and "into." I'm glad I checked myself into the hospital because the pain turned out to be appendicitis!
3. To officially record someone's or something's arrival at a certain place. In this usage, a noun or pronoun can be used between "check" and "into." Sir, I can check you into the hotel over here. Can you check these books into the system?
4. To investigate something. Please check into these discrepancies in the budget, and let me know what you find out.
See also: check
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

check into

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.
See also: check
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

check into

v.
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.
See also: check
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
See also:
References in periodicals archive ?
After the show wrapped up, Clarkson checked herself into the emergency room.
The Idaho State Journal reports the 57-year-old Pocatello woman checked herself into the South East Idaho Behavioral Crisis Center for several days and says the experience has dramatically improved her outlook.
Celebrity website TMZ said Spears voluntarily checked herself into a residential mental health facility about a week ago.
BRITNEY Spears has checked herself into a mental health facility as she struggles to cope with her dad's declining health.
An insider at the time disclosed to Us Weekly that the "She's The Man" star checked herself into the rehab center because she not comfortable with the "pressure" of being back on the spotlight.
"She checked herself into a treatment facility to aid in her wellness plan," a source reportedly told ETOnline.com.
"She checked herself into a treatment facility to aid in her wellness plan and is looking forward to coming out of this revitalised and ready to tackle the exciting new projects that await her," added the source.
She was said to have checked herself into a rehab shortly after the show ended and has reportedly got her grooves back on the road.
EXHAUSTED Rita Ora checked herself into hospital after "working and partying too much", sources claim.
But despite not having the substance or behavioral addictions widely associated with rehab, she checked herself into a five-week program, one week after a family member checked out, to discover her part in the dysfunction of her life.
"Following his death last Saturday, the woman, who has a number of previous convictions, checked herself into hospital for psychiatric treatment.
FORMER wild child Lara Stone once fought bouncers outside bars and checked herself into a booze clinic.
Summary: Singer Sarah Harding has reportedly checked herself into a rehabilitation centre.
Frost, who checked herself into a clinic to be treated for depression, said she now enjoyed a happy home life.