What is another word for dost again?
Pronunciation: [dˈɒst ɐɡˈɛn] (IPA) 
The phrase "dost again" might seem a bit archaic and unfamiliar to some people, but essentially it means "do so again" or "repeat what you just did". There are plenty of synonyms for this expression, depending on the context and tone of the conversation. Some possibilities include "go ahead", "carry on", "keep it up", "continue", "do it again", "repeat", "reiterate", "redo", "replay", "reperform", "reproduce", "revoke", "reincorporate", "retrace", "revisit", "reexamine" and "rediscover". All of these phrases essentially convey the idea of doing something again, either immediately or at a later time.
