Meaning of “antagonist” in the English Dictionary

"antagonist" in English

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antagonistnoun [ C ]

uk /ænˈtæɡ.ən.ɪst/ us /ænˈtæɡ.ən.ɪst/

antagonist noun [ C ] (PERSON)

formal a person who is strongly opposed to something or someone:

The antagonists in this dispute are quite unwilling to compromise.
He sued several of his antagonists for libel.
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antagonist noun [ C ] (MUSCLE)

specialized anatomy a muscle that performs the opposite action to another muscle, for example making a movement slower or returning the body to its original position

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antagonist noun [ C ] (CHEMICAL)

specialized biology, chemistry a substance that stops or reduces a change or reaction in the body:

a seratonin antagonist
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(Definition of “antagonist” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"antagonist" in American English

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antagonistnoun [ C ]

us /ænˈtæɡ·ə·nɪst/

a person who opposes or disagrees with another

(Definition of “antagonist” from the Cambridge Academic Content Dictionary © Cambridge University Press)