noun
losing every match; defeated in every battle
Used when someone or a team has lost every single contest or battle they participated in. Often carries a nuance of complete failure or hopelessness.
そのチームは全戦全敗でシーズンを終えた。
That team finished the season with a complete losing record.
彼は全戦全敗のまま引退した
He retired without ever winning a single match.