Meaning of “champion” in the English Dictionary

"champion" in British English

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championnoun [ C ]

uk /ˈtʃæm.pi.ən/ us /ˈtʃæm.pi.ən/

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.

championverb [ T ]

uk /ˈtʃæm.pi.ən/ us /ˈtʃæm.pi.ən/

to support, defend, or fight for a person, belief, right, or principle enthusiastically:

He has championed constitutional reform for many years.

championadjective, exclamation

uk /ˈtʃæm.pi.ən/ us /ˈtʃæm.pi.ən/ Northern English informal

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

"champion" in American English

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championnoun [ C ]

us /ˈtʃæm·pi·ən/

champion noun [ C ] (WINNER)

short form champ, /ˈtʃæmp/ someone or something, esp. a person or animal, that has beaten all other competitors in a competition:

a tennis champion

champion noun [ C ] (SUPPORT)

a person who enthusiastically supports, defends, or fights for a belief or principle:

a champion of free speech
champion
verb [ T ] us /ˈtʃæm·pi·ən/

He championed protection of the wilderness.

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