wash something down
phrasal verb with wash verb uk/wɒʃ/ us/wɑːʃ/
(CLEAN)
（用液体）清洗，冲刷（大件物品或表面）
to clean a large object or surface with a liquid
He washed the car down with soapy water. 他用肥皂水清洗汽车。
(EAT)
informal（就着饮料）吃下，吞下
to eat food or swallow medicine with a drink that helps or improves it
Supper was fresh salmon and vegetables, washed down with a bottle of white wine. 晚餐有新鲜的三文鱼和蔬菜，就着一瓶白葡萄酒一起下肚。