To be utterly destitute; to have nothing at all, not even a roof over one's head or a place to stand.
他因为生意失败，一下子变得上无片瓦遮身，下无立锥之地，生活陷入了困境。
After his business failed, he suddenly became utterly destitute, without a roof over his head or a place to stand, and his life fell into hardship.
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