What is the meaning of Blindage?

A cover or protection for an advanced trench or approach, formed of fascines and earth supported by a framework.

A deep dugout, often equipped with bunks and other fittings.

A final layer of material such as sand or road scrapings that is spread to fill in any small gaps in the road surface and soak up any wet spots.

armour, armour plating

Source: wiktionary.org