'Shadow' in the Bible

Neither said they, Where is the LORD that brought us up out of the land of Egypt, that led us through the wilderness, through a land of deserts and of pits, through a land of drought, and of the shadow of death, through a land that no man passed through, and where no man dwelt?

And you, Zion, city doomed to destruction, you accomplish nothing by wearing a beautiful dress, decking yourself out in jewels of gold, and putting on eye shadow! You are making yourself beautiful for nothing. Your lovers spurn you. They want to kill you.

Give glory to the LORD your God, before he cause darkness, and before your feet stumble upon the dark mountains, and, while ye look for light, he turn it into the shadow of death, and make it gross darkness.

They that fled stood under the shadow of Heshbon because of the force: but a fire shall come forth out of Heshbon, and a flame from the midst of Sihon, and shall devour the corner of Moab, and the crown of the head of the tumultuous ones.