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。

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。