[bù dé bù]
have no choice but to; be bound to; be obliged to do sth.; cannot but; have to; cannot choose but; can't do better than; can't help but; can't keep from; can not refrain from; compel; force sb. to do sth.; have no option but to
have to plead guilty
不得不低头认罪
As time is limited, I have to hurry.
时间有限, 我不得不赶紧。
I cannot but agree to your decision.
我不得不同意你的决定。