不得不 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 不得不低头认罪 have to plead guilty; 时间有限, 我不得不赶紧。 as time is limited, i have to hurry. 我不得不同意你的决定。 i cannot but agree to your decision