[英和辞典] 断崖（だんがい），絶壁
[英英辞典] precipice: a very steep, perpendicular, or overhanging place.(Dictionary.com)
[例文]As her country hovers on the precipice of chaos, Maleeha Lodhi, the High Commissioner of Pakistan in Britain, works all the angles to persuade the British government and public alike that British Pakistanis are normal people.