ninelife; age; generation; era; world; lifetime 's; him/her/it; thissurname; match; mate; hatred; animosity; enmity; a rival; an enemy; feud simp. and trad.
九 世 之 仇
From the story of two ancient states during Western Zhou dynasty:
Duke Ai of Qi had a dispute with his neighbouring state Ji (紀). King Yi of Zhou sided with Marquis of Ji and executed Duke Ai. Later, Duke Xiang of Qi, ninth-generation descendant of him, conquered the State of Ji, to revenge for him.