The phrase "haddest a stab" is an archaic expression that means "attempted" or "tried". It is spelled with an added "-d" to indicate the past tense of "have", and "a" is used as a substitute for "at". The word "stab" is pronounced with the IPA phonetic transcription of /stæb/, meaning that it is pronounced with a short "a" sound, followed by a voiced "b". Despite its antiquated usage, "haddest a stab" still appears occasionally in literature or speeches.