"关窗户"的英文是"close the window"。

来源：

"Close"是英文动词，意思是"关闭"，"the window"是英文名词，意思是"窗户"。所以"close the window"的意思就是"关窗户"。

英文例句及其中文翻译：

Could you close the window, please? 你能关窗户吗，请？
The room is too hot. I'm going to close the windows. 这房间太热了。我要关窗户。
I always close the windows before I go to bed at night. 我每晚睡觉前都会关窗户。