The phrase "gat the act" is a slang term that means to start or begin something. There are many synonyms for this phrase that can be used depending on the context. For example, phrases like "get the ball rolling," "kick off," and "start the show" all imply starting something. Other synonyms include "set the tone," "break ground," and "initiate." These phrases can be used in different situations, such as starting a meeting or beginning a project. It's always important to carefully consider the meaning and context of any phrase or word when using it.