qīng guó qīng chéng
lit. capable of causing the downfall of a city or state (idiom)
fig. (of a woman) devastatingly beautiful; also written 傾城傾國|倾城倾国[qing1 cheng2 qing1 guo2]
倾
qīng
to overturn
国
guó
country; nation; state
城
chéng
city walls