云的英语单词是 cloud。它可以作为名词，表示云、云朵或云状物；也可以作为动词，表示使难以理解、使记不清楚、使模糊、显得阴沉、看起来忧愁、混淆、搅混等。例如：
1. The sun burst through the clouds.（太阳破云而出）
2. It was cloudy in the morning and did not begin to clear up until the afternoon.（早晨还是阴沉沉的，到午后才逐渐开朗起来）
3. The plane was flying in cloud most of the way.（飞机一路大多在云层里飞行）