The phrase 'sign things come' is usually used to refer to an omen or a warning indicating that something is about to happen. However, there are many different synonyms that can be used to describe this concept. Some of these synonyms include portent, harbinger, precursor, augury, signal, forewarning, premonition, and auspice. Each of these words conveys a slightly different shade of meaning, but they all essentially express the idea that some event is on the horizon. Whether you use one of these synonyms or the original phrase, it's always a good idea to pay attention to the signs around you and prepare for what's to come.