officer of the day

noun Military.
an officer who has charge of the guard and prisoners on an assigned day at a military installation. Abbreviation: OD, O.D., O.O.D.

Origin:
1835–45

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World English Dictionary
officer of the day
 
n
Also called: orderly officer a military officer whose duty is to take charge of the security of the unit or camp for a day

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Conducts officer of the day and back-up duties as required.
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