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dim-out

[dim-out] /ˈdɪmˌaʊt/
noun
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.
Also, dimout.
Compare blackout (def 2), brownout
Origin
1940-1945
1940-45; dim + (black)out
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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