The word "didst to turn" is an archaic verb phrase that is no longer commonly used in modern English. However, there are a few synonyms that can be used instead to convey the same meaning of "to turn" or "to change direction". Some of these synonyms include "rotate", "pivot", "whirl", "twirl", "spin", "swerve", "veer", "shift", "change course", and "divert". Depending on the context and intended meaning, each of these synonyms can be used to replace "didst to turn" and add color and variety to your writing or speech.