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English definition of “sympathizer”

sympathizer

noun [C] (UK usually sympathiser)     /ˈsɪm.pə.θaɪ.zər/ US  /-zɚ/
a person who supports a political organization or believes in a set of ideas: He had been a known IRA sympathizer.Supporters, members and defendersBelievers and non-believers
(Definition of sympathizer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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