champion

US /'tʃæmpɪən/

UK /'tʃæmpɪən/

A2
n. (c./u.)Noun (Countable/Uncountable)Person who fights for or supports strongly
Mother Theresa was a champion for human rights in India
v.t.Transitive VerbTo support or fight for something you believe in
She agreed to champion the protest against sexual harassment at her workplace
adj.AdjectiveBeing the best of all.
He is a champion athlete.
n. (c./u.)Noun (Countable/Uncountable)The title given to the winner of a competition.
He became the world champion in boxing.