Antonyms for the phrase "cut of pie" could vary depending on the context and interpretation of the phrase. However, some possible antonyms could include "whole pie," "uncut pie," or "unaltered pie." Each of these phrases suggests a pie that has not been divided or tampered with in any way. Additionally, "remaining pie" or "leftover pie" could also be considered antonyms, as they imply that there is still pie left after some has been removed or consumed. Regardless of the specific antonym used, it is important to consider the context and intended meaning of the phrase.