"Hadst got to" is an archaic phrase used in old English literature, and it essentially means "had to." Synonyms for this phrase include "needed to," "required to," "had to," "was obliged to," "was compelled to," "was forced to," "had no choice but to," "had no alternative but to," "had to go through with," "had to adhere to," and "must have done." Each of these phrases can be used interchangeably depending on the context of the sentence or the writer's purpose. Overall, these synonyms aptly express the sense of urgency and obligation conveyed by the phrase "hadst got to".