Antonyms for the phrase "put zip in to" could refer to actions that have the opposite effect of energizing or adding excitement. These might include dulling, deflating, discouraging, or exhausting activities. In contrast to sparking energy, antonyms might involve boredom, discouragement, lethargy, or apathy. Actions that might be considered antithetical to putting zip in to could include watching a movie that fails to engage, being stuck in traffic or waiting in line, feeling dejected or demoralized, or simply being too tired to feel enthusiastic. Antonyms for "putting zip in to" are therefore a matter of negativity or withdrawal, rather than actively promoting enthusiasm or liveliness.