When someone says "eat up!", they are typically encouraging someone to finish their meal or eat everything on their plate. However, there are many synonyms for this phrase that can be used interchangeably such as "clean your plate", "finish your food", "conquer your meal", "devour your dish", "polish off your plate", "satisfy your hunger", "fulfill your appetite", and "empty your plate". All of these phrases convey the same message and can be used when encouraging someone to eat all the food they have been served or prepared for themselves. Whether it's encouraging children to finish their greens or simply reminding a friend to enjoy their meal, there are plenty of ways to express the sentiment of "eat up!".