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See also: FoE and FOE



Etymology 1[edit]

Middle English fo ‎(foe; hostile), from earlier ifo ‎(foe), from Old English ġefāh ‎(enemy), from fāh ‎(hostile), from Proto-Germanic *faihaz (compare Old Frisian fāch ‎(punishable), Middle High German gevēch ‎(feuder)), from Proto-Indo-European *peik/k̑- ‎(to hate, be hostile) (compare Middle Irish óech ‎(enemy, fiend), Latin piget ‎(he is annoying), Lithuanian pìktas ‎(evil), Albanian pis ‎(dirty, scoundrel)).


foe ‎(comparative more foe, superlative most foe)

  1. (obsolete) Hostile.
    • 1603, John Florio, translating Michel de Montaigne, Essays, vol.1, ch.23:
      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 [].


foe ‎(plural foes)

  1. An enemy.
    • 2013 June 29, “Travels and travails”, The Economist, volume 407, number 8842, page 55: 
      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.

Etymology 2[edit]

An acronym of "fifty-one ergs", coined by Gerald Brown of Stony Brook University in his work with Hans Bethe.


foe ‎(plural foes)

  1. A unit of energy equal to 1044 joules.