The phrase "hadst a hold upon" is quite archaic and hardly used in modern English. However, there are several synonyms that can be used in its place, such as "had a grip on," "held onto tightly," "grasped," or "clung to." Other similar expressions that convey the same meaning include "had control over," "dominated," "influenced," or "exerted power." These synonyms can be used in writing or conversation to replace the outdated phrase and convey a clearer message. By using more straightforward and commonly used terms, readers or listeners can understand the intended meaning more quickly and efficiently.