Meaning

• To 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."

• To withdraw (an item), as from a library, and have the withdrawal recorded.

  "He checked his favorite mystery out for the twenty-third time."

• To 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."

• To examine, inspect, look at closely, ogle; to investigate; to gather information so as to make a decision.

  "Check it out! Best prices in town."

• To obtain source code from a repository.

• To become uninterested 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.

• (by extension) To die.

• To 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."