The phrase "ring the curtain" is often used in theater to signify the start or end of a performance. However, there are other phrases that can be used as synonyms for this expression. One alternative is "lower the curtain," which also indicates the conclusion of a show. Another option could be "raise the curtain," which signals the beginning of a performance. Additionally, some alternate phrases include "draw the curtain" or "pull the curtain," which are both common in theatrical settings. No matter which phrase is used, the underlying meaning is the same - to mark the start or end of a theatrical production.