a reduction or concealment of night lighting in wartime to make the source less visible to an enemy from the air or sea.
a reduction of night lighting caused by a failure in an electric generating system or a reduction in its output.
Origin of dim-out
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for dim-out
Historical Examples of dim-out
Along the shore no lights were showing for the dim-out was rigidly enforced at Sunset Beach.Voice from the Cave
Mildred A. Wirt