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A foe is an enemy — a person, a group, or a country that is against you. You will see it in stories, games, and headlines: friend or foe, our foes. Though actually, in ordinary talk people almost always say enemy. Foe feels a little like a story-book word, or a short, strong word for news. It can also name a thing that works against you, not a person: writers call disease or poverty an old foe. It is not a rude word; it is just not the everyday one. Calling a your foe in real life will sound like a game, or a joke.
敵人、仇敵（故事、標題裡較常見；口語多說 enemy）
組成It does not split into pieces you can see. It comes from Old English, where it already meant enemy. A very old root in that family of languages had to do with hating or being against someone.
原始詞典資料9 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Foename
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A surname from German.
foeadj詞源 1/fəʊ/
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obsoleteHostile.
- he, I say, could passe into Affrike onely with two simple ships or small barkes, to commit himselfe in a strange and foe countrie, to engage his person, under the power of a barbarous King […].
foenoun詞源 1/fəʊ/
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An enemy.
- And a mans foes ſhalbe they of his owne houſhold.
- Even without hovering drones, a lurking assassin, a thumping score and a denouement, the real-life story of Edward Snowden, a rogue spy on the run, could be straight out of the cinema. But, as with Hollywood, the subplots and exotic locations may distract from the real message: America’s discomfort and its foes’ glee.
foenoun詞源 2/fəʊ/
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A unit of energy equal to 10⁴⁴ joules.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。