The word "most slivered" is spelled /moʊst ˈslɪvərd/. The first syllable "mo" is pronounced with a long "o" sound and the "o" sound is carried over into the second syllable "st". The second syllable "sliv" is pronounced with a short "i" sound and the "v" is voiced. The third syllable "-er" is pronounced with a schwa sound, and the final syllable "ed" is pronounced with a "d" sound. Overall, the spelling of "most slivered" is consistent with English spelling rules.
It seems that "most slivered" is not a widely recognized phrase or term, and therefore it doesn't have a specific etymology. However, I can provide some information on the words "most" and "slivered" separately.
The word "most" originated from the Old English word "mǣst", which means "greatest" or "highest". It was used to indicate the superlative degree of adjectives or adverbs. Over time, it evolved and became commonly used as an intensifier.
On the other hand, "slivered" is the past participle of the verb "sliver". "Sliver" comes from the Old Norse word "slífa", meaning "to slice". It entered the English language in the 14th century, and it refers to cutting or breaking something into long, narrow pieces or fragments.