"hadst hold upon" is an archaic phrase that means "had a grip on" or "had control over." Some synonyms for this phrase include "had possession of," "had mastery over," "had command of," and "had dominion over." These words express a sense of power and authority, suggesting that someone or something had a firm and undeniable grasp on a situation or object. Other possible synonyms for "hadst hold upon" could include "had a firm grip on," "had a tight hold on," or "had a secure grasp on." All of these options bring to mind an image of strength and control.