an·tag·o·nist /-nɪst/
 敵手,對手
 an·tag·o·nist /-nəst/ 名詞
 對抗物
 an·tag·o·nist n.
 1. One who contends with another, especially in combat; an adversary; an opponent.
    Antagonist of Heaven's Almighty King.   --Milton.
    Our antagonists in these controversies.   --Hooker.
 2. Anat. A muscle which acts in opposition to another; as a flexor, which bends a part, is the antagonist of an extensor, which extends it.
 3. Med. A substance which opposes the actions of another substance in the body, especially a drgu that counteracts the effects of another drug.
 Syn: -- Adversary; enemy; opponent; foe; competitor. See Adversary.
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 An·tag·o·nist, a. Antagonistic; opposing; counteracting; as, antagonist schools of philosophy.
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 antagonist
      n 1: someone who offers opposition [syn: adversary, opponent,
            opposer, resister] [ant: agonist]
      2: a muscle that relaxes while another contracts; "when bending
         the elbow the triceps are the antagonist"
      3: a drug that neutralizes or counteracts the effects of
         another drug [ant: synergist]