The word "prolong" refers to extending the duration or length of something. There are many synonyms for this word that can be used depending on the context. These include "lengthen," "extend," "stretch," "draw out," "continue," "elongate," "protract," "delay," "persist," "carry on," "push back," "prolongate," "sustain," "keep going," and "spin out." All of these words convey the idea of making something last longer, whether it be an event, a conversation, or a process. By using different synonyms for "prolong," writers and speakers can vary their language and add nuance to their message.