The crossword solution for the term DARKEN, AS A WINDSHIELD is TINT. Tinting a windshield is a process that involves applying a thin film to the glass in order to reduce the amount of light that passes through it. This can be done for a variety of reasons, such as reducing glare, providing privacy, or blocking out harmful UV rays. Tinting a windshield can also darken the glass, making it less visible from the outside.