'Turning' in the Bible

yea, he casteth out the man, and causeth to dwell at the east of the garden of Eden the cherubs and the flame of the sword which is turning itself round to guard the way of the tree of life.

and he sendeth forth the raven, and it goeth out, going out and turning back till the drying of the waters from off the earth.

And the king of Sodom goeth out to meet him (after his turning back from the smiting of Chedorlaomer, and of the kings who are with him), unto the valley of Shaveh, which is the king's valley.

and Isaac goeth out to meditate in the field, at the turning of the evening, and he lifteth up his eyes, and looketh, and lo, camels are coming.