The spelling of the word "haddest stab" can be explained using the International Phonetic Alphabet (IPA). "Haddest" is pronounced as /ˈhæd.əst/, with the stress on the first syllable, and is the second person singular past tense of the verb "have." "Stab" is pronounced as /stæb/ and means a sudden sharp pain, or a thrust with a pointed object. Together, "haddest stab" means you had delivered a sudden sharp pain or a thrust with a pointed object in the past.