Prepone is a word that is widely used in India and largely unknown around the world. It means to bring forward or move up. However, due to its lack of use outside of South Asia, it has no widely accepted synonyms in the English language. Some would suggest that bringing forward or moving up are the best alternatives, whilst others may suggest using phrases like rescheduling or advancing. Ultimately, the lack of accepted synonyms for prepone highlights the unique nature of Indian English, where certain phrases and words have their own specific meanings and usages.