Haddest it out is spelled as /ˈhædɪst ɪt aʊt/, with the first syllable pronounced as "had" and the second syllable as "dest". The word "haddest" is the past tense and past participle form of the verb "have" and is used in the second person singular. "It out" is used to mean settle an argument or dispute. The spelling of "haddest it out" adheres to the rules of English pronunciation and grammar, making it easy to understand and use correctly in written and spoken language.