不得不
Pinyin: bù dé bù
have no choice but to
Example sentence
下大雨，我们不得不留下。
Xià dà yǔ, wǒmen bùdébù liúxià.
It poured, so we had to stay.
What 不得不 means
不得不 (bù dé bù) is a Chinese word meaning “have no choice but to”. It belongs to the Grammar Words topic and appears at HSK 4, so it is one of the words worth learning early when you study Chinese.