A person or team that has lost (a match, contest, etc.); the defeated party.
試合の敗者は悔しそうにベンチを降りた。
The loser of the match went down to the bench looking upset.
トーナメントで敗者復活戦が行われる。
A repechage (losers' bracket) match is held in the tournament.
彼は敗者として多くのことを学んだと語った。
He said he learned a lot as a loser.