Correct spelling for the English word "Wost" is [wˈɒst], [wˈɒst], [w_ˈɒ_s_t] (IPA phonetic alphabet).
The word "wost" is a Middle English term that comes from the Old English word "wæs" (pronounced "wahs"). It is the past tense of the verb "be". In Old English, "wæs" was used for the first and third person singular, while "wǣron" was used for the plural. Over time, "wæs" transformed into "wost" and eventually evolved into the modern English word "was".