An ongoing winner in a game or contest.
Someone who is chosen to represent a group of people in a contest.
Someone who fights for a cause or status.
Someone who fights on another's behalf.
To promote, advocate, or act as a champion for (a cause, etc.).
To challenge.
Acting as a champion; that has defeated all one's competitors.
Excellent; beyond compare.
(predicative) Excellent; brilliant; superb; deserving of high praise.