ultimatum
/ˌʌltɪˈmeɪtəm; ˌʌltə`metəm/ n
(pl ~s or -ta / -tə; -tə/) final demand or statement of terms to be accepted without discussion, eg one sent to a foreign government and threatening war if the conditions are not accepted 最後通牒; 哀的美敦书
accept, reject, issue, deliver an ultimatum 接受、 拒绝、 发出、 送交最後通牒.