The phrase "hast a hold upon" means that someone or something has a strong grip or control over something else. The spelling of "hast" is derived from the archaic form of the verb "have" (present-tense second-person singular), which was commonly used in Early Modern English. The IPA transcription of "hast" is /hæst/, indicating that it is pronounced with a short "a" sound followed by "st" consonant cluster. Meanwhile, "hold" and "upon" have straightforward spellings and are pronounced /hoʊld/ and /əˈpɑn/, respectively.