The word "hadst the law on" is an archaic phrase meaning "to be under the control or jurisdiction of the law." Its spelling is influenced by Middle English and Old English, which used the second-person singular past tense form "hadst" for "had." The "st" at the end of "hadst" indicates that it is in the second-person singular form. The "on" at the end of the phrase means "in the possession or control of." The phonetic transcription of the word is /hædst ði lɔ ɒn/.