Definitions from Wiktionary (check out)

▸ verb:  (intransitive) To confirm and pay for goods and services at a facility (e.g.: supermarket, online store, hotel) when leaving.
▸ verb:  (transitive) To withdraw (an item), as from a library, and have the withdrawal recorded.
▸ verb:  (transitive) To record (someone) as leaving the premises or as taking something therefrom, as from a library or shop.
▸ verb:  (transitive) To examine, inspect, look at closely, ogle; to investigate; to gather information so as to make a decision.
▸ verb:  (transitive, programming) To obtain source code (and/or other material) from a source control repository so that one can modify it (and often later "check in" the modified version back).
▸ verb:  (intransitive) To become uninterested in an activity and cease to participate in more than a perfunctory manner; to become uncooperative.
▸ verb:  (intransitive) To become catatonic or otherwise nonresponsive.
▸ verb:  (intransitive) To leave in a hurry.
▸ verb:  (intransitive, euphemistic, by extension) To die.
▸ verb:  (intransitive) To prove (after an investigation) to be the case, or to be in order.
▸ verb:  (darts) To visit the oche for the last time and clear one's remaining points to win the game.

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