The antonyms for the phrase "go back word" are myriad since it is a multi-dimensional term. The phrase can mean to regress, to retreat, or to withdraw. The antonyms for the term, therefore, would depend on the context in which it is used. For instance, if the phrase is used to imply moving forward, then the antonyms would include advancing, progressing, or moving on. If the phrase implies breaking away from a wrong idea, antonyms would include justify, validate, or confirm. In essence, the antonyms for the phrase would depend on the situation to which it is applied.