Meaning of bù xǔ:
bù xǔ
不许
Verb
not to allow; must not; can't
Tāmen bù xǔ zài zhèlǐ pāizhào.
他们不许在这里拍照。
They are not allowed to take photos here.
Zài zhège túshūguǎn lǐ, nǐ bùxǔ dàshēng shuōhuà.
在这个图书馆里，你不许大声说话。
In this library, you must not speak loudly.
Lǎoshī shuō wǒmen bùxǔ zài kètáng shàng wán shǒujī.
老师说我们不许在课堂上玩手机。
The teacher said we can't play on our phones in class.
