[dim-out] 
| 1. | a reduction or concealment of night lighting in wartime to make the source less visible to an enemy from the air or sea. |
| 2. | a reduction of night lighting caused by a failure in an electric generating system or a reduction in its output. |
| dimout | |
noun | |
| darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft) [syn: blackout] |
