side order
noun [ C ] uk/ˈsaɪd ˌɔː.dər/ us/ˈsaɪd ˌɔːr.dɚ/ (UK also side dish); (US informal side)
（餐馆食物的）配菜，附加菜
in a restaurant, an extra dish of food, for example vegetables or salad, that is served with the main dish, sometimes on a separate plate