关窗户

You can use it as a command or a statement. Add 请 at the beginning to be polite. You can also add 把 to make it sound more natural. For example: 请把窗户关上. This sounds more like 'Please close the window' rather than just 'Close window'.

Use it when the air conditioning is on. Use it when it starts to rain suddenly. Use it if the street noise is too loud. It is perfect for home, office, or even in a taxi. If you feel a draft, this is your go-to phrase.

Don't use it for digital 'windows' on a computer. For those, you usually just say 关掉 or 关闭. Also, don't use it for 'closing' a business or a shop. That requires different words like 关门. If you are closing your eyes, use 闭眼 instead.

In China, there is a strong belief in 'Feng Shui' and air circulation. However, many people are also very sensitive to 'chuan tang feng' (drafts). You might find people closing windows even in summer to avoid a breeze. In big cities, 关窗户 is the first defense against smog or noise. It’s a small act that creates a private, safe space.

You will often hear 关窗. This is just a shorter, snappier version. In the north, people might add an 'r' sound: 窗户口儿. If you want to be extra clear, say 关好窗户. This means 'close the window properly' so it doesn't rattle. It’s a tiny change that makes you sound like a pro.