The phrase "un shuts" doesn't exist in the English language however, assuming the intended word is "shutdown," there are numerous synonyms that could be used in its place. Some examples include: closure, cessation, termination, halt, stoppage, outage, discontinuation, suspension, and interruption. These words convey the sense of something coming to an end or a pause being taken. Whether discussing a business, a computer system, or a government, the concept of a shutdown can be understood by using any of these synonyms. Each one has its own nuance, but all convey the idea of something being put on hold or stopped for a period of time.