'Swinging' in the Bible

“When you besiege a city a long time, to make war against it in order to capture it, you shall not destroy its trees by swinging an axe against them; for you may eat from them, and you shall not cut them down. For is the tree of the field a man, that it should be besieged by you?

Each of the doors had two leaves, two swinging leaves; two leaves for one door and two leaves for the other.