Difference between Check Out and Check Up On

CHECK OUT vs CHECK UP ON: VERB

Try to learn someone's opinions and intentions
Announce one's departure from a hotel
Withdraw money by writing a check
Trace
Be verified or confirmed; pass inspection
Examine so as to determine accuracy, quality, or condition
To confirm and pay for goods and services at a facility (e.g.: supermarket, online store, hotel) when leaving.
To withdraw (an item), as from a library, and have the withdrawal recorded.
To record (someone) as leaving the premises or as taking something therefrom, as from a library or shop.
Record, add up, and receive payment for items purchased
(computer science): To obtain source code from a repository.
To become disinterested in an activity and cease to participate in more than a perfunctory manner; to become uncooperative.
To become catatonic or otherwise nonresponsive.
To leave in a hurry.
To die.
To prove (after an investigation) to be the case / in order.
To examine, inspect, look at closely, ogle; to investigate.

See, Checking, Look, Trace, Suss out, Sound out, Go over, Feel out, Check up on, Check over, Check into, Check, Run down, Cheque, Look into

Ascertain, Verify, Examine, Watch, Test, See, Checking, Look, Trace, Sound out, Check up on, Check, Run down, Cheque, Look into

Check out the electives and other resources to round out the high school years.
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All staff we encountered were very pleasant and friendly, a shout out especially to Infiniti at check out.
Check out these tips to get out or prevent them from keeping you longer than expected!
Simpsons and Tapped out news, check out the cover for this Mixtape to other users objects.
Before you head over to the nearest payday lender or check cashing store, check out the low cost solution offered by your credit union.
Also, watch out for newly created advocacy groups that will be difficult to check out.
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Tal personally called to check up on me.
Every so regularly you row square up and down to check up on watchful on the compel deceitfully from Mommy and Me music class.
So my questions are, is it worth making my own references up and do they check up on the references you give?
With a straight up access to your secure shell command line you can check up on your server anywhere you are.
Use a pet camera set up in the room your dog is so you can periodically check up on them during the day.
Now he keeps showing up at her work and calls her friends to check up on her.
Accountants set up financial record keeping systems, fill them in, and check up on them.
Earlier John could easily walk up to any team member and check up on them.
The next morning, I woke up to check up on Queen.
You can also check up on old friends, investigate online date information, reconnect with family members, and even check yourself.