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Use "sublieutenant" in a sentence
"Ensign was the lowest rank in the US Army until 1800; the naval rank of ensign wasn't used until 1862, and of course the British equivalent is still sublieutenant."
"As soon as I get over this bronchitis/ear infection/etc crap, I must come over and play with the future Commander in Chief, and her sublieutenant too."
"As to my forefathers, they have always been a poor lot; my own father was a sublieutenant in the army."