Correct spelling for the English word "haddest case" is [hˈadəst kˈe͡ɪs], [hˈadəst kˈeɪs], [h_ˈa_d_ə_s_t k_ˈeɪ_s] (IPA phonetic alphabet).
The phrase "haddest case" is an archaic form of English that was used in Early Modern English, particularly during the Elizabethan era. In this context, "haddest" is the second person singular past tense of the verb "to have", meaning "you had". The word "case" refers to a situation or circumstance.
The etymology of the word "had" can be traced back to the Old English word "habban", which means "to have" or "to hold". In Middle English, it evolved into the word "had" with the same meaning. Over time, the verb form "haddest" emerged as the second person singular past tense of "to have".
As for the word "case", it comes from the Old French word "cas" and ultimately derives from the Latin word "casus", meaning "fall" or "occasion".