The phrase "hadst go at" may seem confusing in terms of spelling, but it can be easily explained through IPA phonetic transcription. The word "hadst" is actually the archaic second person singular form of the verb "have" in the past tense. Its IPA transcription is /hædst/. The word "go" is straightforward, with its IPA transcription being /ɡoʊ/. Therefore, "hadst go at" can be understood as an old-timey way of saying "you had a try" or "you attempted something".