Definitions
1.verbTo confirm and pay for goods and services at a facility (e.g.: supermarket, online store, hotel) when leaving."Be sure to check out of the hotel before noon."
2.verbTo withdraw (an item), as from a library, and have the withdrawal recorded."He checked his favorite mystery out for the twenty-third time."
3.verbTo record (someone) as leaving the premises or as taking something therefrom, as from a library or shop."The desk clerk checked out the family that had been staying in room 322."
4.verbTo examine, inspect, look at closely, ogle; to investigate; to gather information so as to make a decision."Check it out! Best prices in town."
5.verbTo obtain source code from a repository.
6.verbTo become uninterested in an activity and cease to participate in more than a perfunctory manner; to become uncooperative.
7.verbTo become catatonic or otherwise nonresponsive.
8.verbTo leave in a hurry.
9.verb(by extension) To die.
10.verbTo prove (after an investigation) to be the case, or to be in order."The first two leads check out; I'll assume the third one is also valid."