Going one better is an idiomatic expression that means to do something even better than what has already been done. There are several synonyms for this expression, such as surpassing, exceeding, outdoing, outperforming, and outshining. To surpass means to go beyond or to do something better than someone else. Exceeding means to go beyond what is expected or required. Outdoing means to do something better than someone else's effort. Outperforming means to do better than someone else in a particular activity or field. And finally, outshining means to shine more brightly or to be more successful than someone or something else. Using these synonyms instead of the overused expression "going one better" can add variety and interest to your writing or speech.