What is "sightlines"

Usage examples of "sightlines".

He crouched, waiting, ready to leap up on the fence, the sightlines beneath the lower branches relatively clear.

Not all the trees the bear had pushed down to clear its sightlines had fallen along that camouflaged path—which ran southeast, if Eddie had his direc­tions right—but most had, as if the force coming out of the box had pushed them that way as they tottered.

With an effort he turned away from it, feeling an almost audible snap as the sightlines of his contact with the sculpture broke, and glanced at Lissa.