The word "pre-side" is not found in the English language, and therefore does not have any antonyms. It is likely that you may have misspelled the word "preside," which means to be in charge of a meeting or event. Antonyms for "preside" could include words such as "attendee," "observer," or "spectator." However, without a clear understanding of the intended word, it is difficult to provide accurate antonyms. It is important to double-check the spelling and meaning of a word before searching for antonyms to ensure accuracy in communication.