Pronunciation: [mˈə͡ʊst ɹˈe͡ɪnɪŋ] (IPA) 
The term "most raining" is not a commonly used phrase in English. It appears to be a combination of the adjective "most" and the verb "rain," however, the correct phrase should be "it is raining the most." The IPA phonetic transcription for "most raining" would be /məʊst ˈreɪnɪŋ/. It is important to use correct grammar and phrasing to avoid confusion and effectively communicate in English.
"Most raining" is not a commonly used phrase in English, so there isn't a specific etymology associated with it. However, if you are referring to the phrase "it is raining the most", the etymology can be explored as follows:
1. Raining: The word "rain" is derived from the Old English word "regn", which itself has roots in the Proto-Germanic language "regna". This can be traced back to the Proto-Indo-European root "*reǵ-", meaning "moist, wet".
2. Most: The word "most" originated from the Old English word "mǣst", which is related to the Old High German word "meist" and the Gothic word "maists". Ultimately, it can be associated with the Proto-Germanic word "*maistaz".
