Embarks upon refers to the act of beginning or starting something. Some antonyms for the expression include cease, abandon, quit, end, and conclude. If one wants to describe the end of an activity, the antonyms of embarks upon could include dismantle, finish, culminate, or wrap up. Suppose one wishes to portray a retreat or a withdrawal, they can opt for the antonyms like discontinue, halt, and suspend. Likewise, other antonyms for embarks upon will depend on the context in which the user wants to convey a specific meaning or idea.