The phrase "hast hold upon" can be replaced with several synonyms depending on the context. If it refers to physical grasp, synonyms such as grips, clutches, and clasps can be used. If it refers to emotional or mental hold, synonyms such as influence, control, and power may be used. In legal terms, "hast hold upon" can be replaced with both synonyms, such as possession, custody, and ownership. Other options include words like grasp, command, sway, and mastery. The choice of synonym will depend on the nuance and tone of the sentence, and the desired impact on the reader or listener.