COD: A common war expression, used of any extra large shell on being fired, or of one from the enemy. The initials are the ordinary commercial abbreviation for "Cash on Delivery," and as used at the front meant that when the big shell hit there would be a deuce to pay. 
References / notes
- Edward Fraser and John Gibbons (1925). Soldier and Sailor Words and Phrases. Routledge, London p.42.
Glossary of words and phrases
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