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Definition of 'antagonist'

Noun

  1. someone who offers opposition
       Synonyms: adversary opponent opposer resister
       Antonyms: 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
       Antonyms: synergist


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