Wiktionary
vb. (context basketball English) To position oneself between an opposition player and the basket in anticipation of getting a rebound.
Usage examples of "box out".
I took the black box out of my bag and positioned it on the night stand next to my bed.
Horris yanked the Tangle Box out from under Abernathy's arm, then lowered his shoulder and knocked the astonished scribe backward into the lake.
Horris yanked the Tangle Box out from under Aber-nathy's arm, then lowered his shoulder and knocked the astonished scribe backward into the lake.
Before they left, he opened the box of Milk Duds, held the box out for Jean and let her take the first piece.
I answered, that was needless, and would take up too much time, for there was no more to be done, but let one of the crew put his finger into the ring, and take the box out of the sea into the ship, and so into the captain's cabin.
They leave them sheathed in bin liners filled with second hand trousers anonymously dumped to be discovered in the morning, and Gwendolyn and Louisa had quite a collection now, sitting in a box out back.