check out

IPA: tʃˈɛkˈaʊt

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

checkout

IPA: tʃˈɛkaʊt

The process of checking out of a hotel, or the latest time to vacate a room in one.
The process of checking out items at a supermarket or library.
The place in a supermarket where this is done.
(Internet, by extension) The process of confirming and paying for an online purchase.
A test to see if some device is functioning properly.
An inspection or investigation.
(darts) The number of points that a player scores on their final, winning visit to the oche.

IPA: tʃˈɛkˈaʊt

Alternative form of checkout [The process of checking out of a hotel, or the latest time to vacate a room in one.]