When you are eating at a restaurant, the server may tell you bon apptit, which means good appetite, or enjoy your meal.

VOA: special.2010.04.18

where you can use your meal account to get like free food

也就说，你能用你的用餐账户获得一顿免费的食物，

有趣的吃东西协会 - SpeakingMax英语口语达人

You do owe her a meal after she solved your attire problem after all.

她把你的外貌问题给解决了，你确实得请她吃一顿饭。

I didn't 课堂 - SpeakingMax英语口语达人