"Scarf down" is a colloquial term that means to eat something quickly and greedily. The antonyms of this phrase would involve words that reflect a slower and more mindful approach to eating. One antonym could be "savor," which means to eat or drink with appreciation, enjoying the flavor and texture of each bite or sip. Another antonym could be "sample," which implies taking small bites of different foods to experience their taste and texture, without the rush to finish quickly. Finally, "nibble" could be an antonym of "scarf down," as it suggests taking small, unhurried bites and being satisfied with a smaller amount of food.