Think of something walking steadily behind you that you cannot shake off, and that always catches you in the end. It may wear the face of a person — the rival who has beaten you three times and is in your half of the draw again. It may wear no face at all, and simply be the bill for what you did, arriving on time. Either way the feeling is the same: this was always going to reach you, and you cannot outrun it.
From the word’s history
The word is the name of Nemesis, the Greek goddess of retribution, taken over into English as a common noun. Her work in the myths was to make sure that what a person had earned came back to them, which is why both a rival you cannot beat and a punishment you cannot dodge are called by her name.
這個字本來是希臘神話裡復仇女神 Nemesis 的名字，後來被英文拿來當普通名詞用。她在神話裡的工作，是確保一個人自己種下的因會回到他身上。所以「打不贏的對手」和「躲不掉的報應」才會共用同一個名字：兩個都是「該來的，一定會來」。
Wiktionary, "nemesis"
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