There are a variety of synonyms for the phrase "went backward," each with its own unique connotations. To retreat or withdraw could imply a strategic move, while regress or relapse suggests a negative change in progress. Backslide, retrogress, and reverse all imply a movement in the opposite direction and a loss of forward momentum. Degenerate and deteriorate suggest a decline in quality or state of being. Finally, depreciate suggests a loss of value or worth. When choosing a synonym for "went backward," it's important to consider the specific context and connotation of the situation.