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F.O.

1.
field officer.
2.
foreign office.
3.
Military. forward observer.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
  • Good gracious, was that Chance—that madman that threw up his clerkship at the F.O.!

    Fan W.H. Hudson (AKA Henry Harford)

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