There are many synonyms for the phrase "go through the roof," which typically means to increase greatly in intensity or cost. Some common alternatives include skyrocket, soar, surge, spike, escalate, and shoot up. These words all convey a sense of rapid and dramatic change, often suggesting an unexpected or unwelcome development. Other related phrases might include "hit the roof," "burst through the ceiling," or "explode onto the scene," each of which emphasizes a sudden and forceful impact. Whatever the phrase, the idea is to convey a sense of something rising or expanding rapidly, often beyond what could have been expected or anticipated.