"Most larboard" is not a commonly used phrase, but it refers to the left side of a ship. The word "larboard" used to be the standard term for this, but it was eventually replaced by "port" to avoid confusion with the similar-sounding word "starboard" for the right side of a ship. The pronunciation of "larboard" is /ˈlɑːbəd/ and the spelling of "most larboard" follows the regular rules for forming the superlative degree of an adjective.
The phrase "most larboard" does not have its own etymology since it is a combination of words. However, we can analyze the etymology of the individual words within the phrase:
1. Most: The word "most" originated from the Old English word "mǣst", meaning greatest or fullest. It is related to the Old High German word "meist", which has the same meaning.
2. Larboard: The word "larboard" was an early English term for the left side of a ship, opposite to "starboard" for the right side. It is derived from the Middle English word "ladde-borde", combining "ladde" (load) and "borde" (side). Over time, sailors began confusing the similar-sounding "larboard" and "starboard", resulting in the replacement of "larboard" with "port" to avoid confusion.