Definition of 一顧傾城 (いっこけいせい)

noun
woman so glamorous as to bring ruin to a country (castle) as its king (lord) is captivated by her beauty, femme fatale(yojijukugo)
Related Kanji
one, one radical (no.1)
look back, review, examine oneself, turn around
lean, incline, tilt, trend, wane, sink, ruin, bias
castle