The phrase "most enemy" is a grammatically incorrect construction, as "most" is an adverb indicating degree or amount, whereas "enemy" is a noun referring to someone who is actively opposed or hostile to another. However, if we were to phonetically transcribe the phrase using the International Phonetic Alphabet (IPA), it would be pronounced as /məʊst ˈɛnəmi/, with a low-mid back rounded vowel in "most" and a schwa sound in the first syllable of "enemy".
The phrase "most enemy" does not have a specific etymology in itself. However, the individual words "most" and "enemy" have their own distinct origins.
The word "most" comes from the Old English word "mǣst", which means "greatest" or "most". It has roots in the Proto-Germanic word "maistaz". Over time, the meaning of "most" has evolved to also indicate a superlative degree.
The word "enemy" has a more complex etymology. It originates from the Old French word "enemi", which comes from the Latin word "inimicus". "Inimicus" combines the prefix "in-" (meaning "not") with "amicus" (meaning "friend"). Therefore, "enemy" ultimately refers to someone who is not a friend or is hostile.