Double back is a phrase that can be replaced with many synonyms depending on the context in which it is used. One of the synonyms for double back is backtrack, which refers to retracing one's steps after going a certain distance or reaching a particular point. Another synonym for double back is volte-face, which describes a sudden and complete change in direction or opinion. In some cases, pivot and turnaround can also be used interchangeably with double back. All of these synonyms imply a need to retrace one's steps or redirect their course to correct a mistake or change direction.