The difference between Check in and Check out
When used as verbs, check in means to announce or record one's own arrival at a hotel, airport etc, whereas check out means to confirm and pay for goods and services at a facility (e.g.: supermarket, online store, hotel) when leaving.
check bellow for the other definitions of Check in and Check out
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Check in as a verb:
To announce or record one's own arrival at a hotel, airport etc.
Examples:
"We got to the hotel last night and checked in at the front desk."
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Check in as a verb:
To verify a person's information and record their arrival, such as at a hotel, airport, etc.
Examples:
"The clerk checked us in at the front desk."
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Check in as a verb:
To contact another person in order to keep the other person informed of one's situation.
Examples:
"Kelly has to check in with her parole officer today."
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Check in as a verb (transitive):
To return (a book to a library, source code to a repository, etc.).
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Check in as a verb:
To visit in order to see how someone is doing.
Examples:
"I just wanted to check in after your accident, how are you recovering?"
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Check out as a verb (intransitive):
To confirm and pay for goods and services at a facility (e.g.: supermarket, online store, hotel) when leaving.
Examples:
"Be sure to check out of the hotel before noon."
"I'm done shopping, so I'll go check out now."
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Check out as a verb (transitive):
To withdraw (an item), as from a library, and have the withdrawal recorded.
Examples:
"He checked his favorite mystery out for the twenty-third time."
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Check out as a verb (transitive):
To record (someone) as leaving the premises or as taking something therefrom, as from a library or shop.
Examples:
"The desk clerk checked out the family that had been staying in room 322."
"The library assistant was checking people out."
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Check out as a verb (transitive):
To examine, inspect, look at closely, ogle; to investigate; to gather information so as to make a decision.
Examples:
"He was hanging out at the beach, checking out the young women in bikinis."
"He checked out the rumor, and managed to verify that it was true."
"'Check it out! Best prices in town."
"'Check ''this'' out! They just arrested the Mayor!"
"When you're there, check out the Cheddar Cheese Museum! It's a hoot!"
"'Check us out on the Web at en.wiktionary.org!"
"I don't know which gym to join, so I'm going to stop by both this weekend to check them out."
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Check out as a verb (transitive, computing):
To obtain source code from a repository.
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Check out as a verb (intransitive):
To become disinterested in an activity and cease to participate in more than a perfunctory manner; to become uncooperative.
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Check out as a verb (intransitive):
To become catatonic or otherwise nonresponsive.
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Check out as a verb (intransitive):
To leave in a hurry.
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Check out as a verb (intransitive, euphemistic, by extension):
To die.
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Check out as a verb (intransitive):
To prove (after an investigation) to be the case / in order.
Examples:
"The first two leads check out; I'll assume the third one is also valid."
"Their stories checked out."