dim out, (in wartime) to reduce the night illumination of (a city, ship, etc.) to make it less visible from the air or sea, as a protection from enemy aircraft or ships.
Idioms
14.
take a dim view of, to regard with disapproval, skepticism, or dismay: Her mother takes a dim view of her choice of friends.
Origin: before 1000;Middle English,Old Englishdim(me), cognate with Old Frisiandim,Old Norsedimmr
O.E. dimm "dark, gloomy, obscure," from P.Gmc. *dimbaz. Not known outside Germanic. Slang sense of "stupid" is from 1892. The verb was also in O.E. Related: Dimly; dimmed.
n. the evening; the night. (Streets.) : Where'll you be this dim?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences from the web
This constellation is the dimmest in the zodiac besides cancer.