'Open' in the Bible

Not a man remained in Ai or Bethel who had not gone out after Israel; they left the city open and pursued after Israel.

When Israel finished slaughtering all the inhabitants of Ai in the open field, in the wilderness where they pursued them, and when all of them had fallen by {the edge of the sword} until they all had perished, all Israel returned [to] Ai and attacked it with {the edge of the sword}.

And Joshua said, "Open the mouth of the cave, and bring to me those five kings from the cave."