nemesis
/nɪˈmɪsɪs/noun
(pl. nemeses /-siːz/)(一般作one's nemesis)
1- the inescapable or implacable agent of someone's or something's downfall, especially when deserved给以报应者, 复仇者; 处罚者：
I am either your saviour or your nemesis.
我或是你的救星, 或会给你带来报应。
1.1
- a long-standing rival; an arch-enemy长期的竞争对手, 世敌; 头号敌人：
will Harry Potter finally defeat his nemesis, Voldemort?
哈里·波特最终能战胜他的头号敌人伏地魔吗？
1.2
- a downfall caused by such an agent天谴; 报应：
one risks nemesis by uttering such words.
说这样的话可能会遭报应的。
1.3
- （常作Nemesis）retributive justice公正的惩罚：
Nemesis is notoriously slow.
众所周知, 公正的惩罚总是姗姗来迟。
词源
late 16th cent.: Greek, literally 'retribution', from nemein 'give what is due'.