v.1. To block someone or something from entering some place: I shut the windows to close out the light. The management closed the striking union out from the factory.
2. To refuse to include someone in a group or activity: The tour guide had to close out many people who wanted to come on the trip because the bus was full. The school closed me out of the class because I registered too late.
3. To discontinue the sale of some merchandise: The store is closing out its old line of hiking boots, so they're on sale. This is a good brand of refrigerator, so buy one before the store closes them out.
4. To terminate something, as a business or an account, by disposing of all its assets: She opened a new bank account and closed out the old one. He closed his savings account out and bought a new car.
5. To bring some activity to an end: This performance will close out our program for the evening. Just when we thought the tennis match might go to a third set, one of the players closed it out with two aces.