The word "otherguise" is not a commonly used term, and some may find its spelling confusing. The IPA phonetic transcription for "otherguise" is /ˈʌðə(r)ɡaɪz/. The first syllable "oth" is pronounced as /ʌð/ while "er" is pronounced as /ə(r)/. The second syllable "guise" has a long "i" sound, pronounced as /ɡaɪz/. The word means "otherwise" or "in another manner". However, it is not recommended to use this word in everyday conversation as it may not be familiar to most people.
The word "otherguise" does not have a clear etymology as it is an archaic term that is rarely used in modern English. However, one can break down the term to understand its components.
The word "other" comes from the Old English "ōþer" or "aþer", meaning "second of two" or "different" and can be traced back to the Proto-Germanic word "antharaz".
The term "guise" originally comes from the Old French word "guise", meaning "manner" or "fashion", which can be further traced back to the Proto-Germanic word "wihsiz" meaning "way" or "manner".
Therefore, it seems that "otherguise" is a combination of the words "other" and "guise", suggesting a different or alternative manner or way of doing something.