What is "no cover"

Usage examples of "no cover".

There was no cover in any direction and the only retreat was back along the slim, exposed bridge or a bone-shattering jump into the empty canal.

Outside lay a double barrier of accordion wire, while beyond the accordion wire was sandy pasture, still picked over by leggy cattle, and providing no cover.

Also God taught that all vessels should be covered, and that when a vessel had no cover it should be considered unclean.