SPAD

World English Dictionary
SPAD (spæd)
 
n acronym for
signal passed at danger: an incident in which a train goes through a red light

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

Spad
Fr. biplane fighter of WWI, 1917, from Fr., from acronym of Societé pour Aviation et ses Dérivés.
Online Etymology Dictionary, © 2010 Douglas Harper
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