To have no other choice; to be forced into doing something against one's will.
被逼得没有办法，不得不这样。
《汉书·王莽传上》为皇帝定立妃后，有司上名，公女为首，公深辞让，迫不得已然后受诏。”
She was迫不得已 to sell her house to pay the medical bills.
Learn the next connected idiom: 迫不得已 (pò bù dé yǐ) → 一如既往 (yī rú jì wǎng)
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