"Tread the boards" is an old-fashioned phrase used to describe the act of performing on stage. However, there are several other synonyms for this phrase, including "take the stage," "perform live," "act out," "play a role," and "appear on stage." These phrases are often used to describe the act of performing in theater, but they can also be used to describe any performance, such as music or dance. Each phrase has a slightly different connotation and can be used in different contexts. For example, "take the stage" is often used to describe a performer who is confident and charismatic, while "appear on stage" might be used to describe someone who is nervous or unsure.