According to the book
Help with idioms, it denotes
old-fashioned and was coined by abbreviating
the title Doctor of Philosophy, Doctor of
Divinity; what four-syllable phrase is it?
Etymology, Etymology, and more Etymology
as well as grammar, usage, euphemism, slang, jargon, semantics, linguistics, neologism, idiom, cant, and argot.
The critically-acclaimed board game
consists of tough questions about the nuances of the English language.
The title Doctor of
Philosophy, Doctor of Divinity is abbreviated as
PhD, DD. However, according to the COD, the
origin of the phrase is unknown
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