To add zip to something is to give it energy, excitement, or vigor. Other synonyms for this phrase can include adding spark, adding pep, adding pizzazz, adding liveliness, adding zest, adding enthusiasm, adding dynamism, adding vitality, adding fervor, and adding animation. By incorporating any of these terms in place of "add zip," a writer can add variety and interest to their prose. It can be helpful to use these synonyms when describing a person's demeanor, a business pitch, or even a recipe. Overall, any of these synonyms can help add flavor to language, making it more vibrant and engaging.