The phrase "dost u turn" is an informal way of suggesting to someone that they should turn around and go in the opposite direction. There are several synonyms that can be used to convey the same meaning, such as "make a u-turn", "turn back", "reverse course", "about-face", "flip-flop", and "change direction". Depending on the context and level of formality required, any one of these synonyms can be used in place of "dost u turn". It's important to keep in mind that the tone and wording used should always be appropriate and respectful to whoever you're addressing.