An enemy or opponent; someone who bears hostility or ill will toward another.
From Old English 'fah' meaning hostile, related to 'feud'. The word is cognate with German 'Feind' and shares roots with words meaning hatred across Germanic languages.
Shakespeare used 'foe' extensively in his plays, and it remains popular in poetry because it's a perfect rhyme for 'woe', 'go', and 'snow'. The phrase 'friend or foe' became crucial in military identification systems, leading to modern IFF (Identification Friend or Foe) technology in aircraft.
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