Black Out 1 : (1) To suppress flames with water, thereby blackening a previously illuminated area. (2) To close off all light, a civil defense operation. See also: Darken, Blacken
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}