The phrase "dost bit" does not exist in the English language as a single word. However, if we break it down into its component parts, "dost" means "do you" in archaic English, and "bit" means "a small piece or quantity of something." Therefore, some possible antonyms for "dost bit" could be "do not" or "not do," and "a large amount" or "a considerable quantity" respectively. Additionally, if we interpret "dost bit" more figuratively, it could be seen as representing a small or insignificant action or gesture, making potential antonyms "significant" or "substantial.