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English definition of “champion”

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champion

noun [C] uk   /ˈtʃæm.pi.ən/ us  

champion noun [C] (WINNER)

B1 ( informal champ) someone or something, especially a person or animal, that has beaten all other competitors in a competition: an Olympic champion She is the world champion for the third year in succession. The defending champion will play his first match of the tournament tomorrow. Who are the reigning European football champions?
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champion noun [C] (SUPPORTER)

C2 a person who enthusiastically supports, defends, or fights for a person, belief, right, or principle: She has long been a champion of prisoners' rights/the disabled/free speech.

champion

verb [T] uk   /ˈtʃæm.pi.ən/ us  
to support, defend, or fight for a person, belief, right, or principle enthusiastically: He has championed constitutional reform for many years.

champion

adjective, exclamation uk   /ˈtʃæm.pi.ən/ Northern English informal us  
(Definition of champion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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