ultimatum
/ˌʌltɪˈmeɪtəm ˌअल्टिˈमेटम्/ noun [C] ( pl. ultimatums )
a final warning to somebody that, if he/she does not do what you ask, you will use force or take action against him/her (आदेश न मानने पर बल प्रयोग की) अंतिम चेतावनी
I gave him an ultimatum—either he paid his rent or he was out.