The spelling of the word "most secondbest" can be explained through its IPA phonetic transcription. The word has a long "o" sound followed by the consonant blend "st" and the vowel sound "e" pronounced as "uh". This is followed by the word "second" with a short "e" sound and ending with "best" pronounced as "best". It means the next best option after the first. This spelling accurately represents the pronunciation of the word and helps in correct phonetic usage.
The phrase "most second best" is not a commonly used term in English, and as such, there is no established etymology for it. The words "most" and "second best" are, however, etymologically distinct on their own.
The word "most" originated from the Old English word "māst", which means "greatest" or "largest". It is derived from the Proto-Germanic word "maistaz". The usage of "most" as a superlative has been present in English since the early Middle English period.
On the other hand, "second best" is a phrase that combines the word "second", derived from the Old French word "secund", meaning "following" or "next after", and "best", which comes from the Old English word "bēst", meaning "good" or "excellent".