"Wast going to" is an archaic phrase that was commonly used in old English literature and is still used in some historical contexts. However, in modern English, there are several synonyms that can replace this phrase. Some of these synonyms include "were about to," "had intended to," "had planned to," or "were on the verge of." These phrases convey a similar meaning to "wast going to," but in a more contemporary language that is easier to understand. It is essential to replace old phrases with modern synonyms to ensure effective communication and avoid language barriers between generations.