Meaning of “champion” - Learner’s Dictionary

champion

noun [ C ] uk us /ˈtʃæmpiən/
WINNER

B1 a person, animal, or team that wins a competition:

a boxing champion
the world champions
SUPPORT

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

a champion of human rights
→ See also reigning champion

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