noun
certain victory; invincibility
Emphatic compound meaning absolute victory or being unbeatable; often used in motivational or martial contexts.
彼は必勝不敗の信念で試合に臨んだ。
He approached the match with an unwavering belief in certain victory.
この戦略は必勝不敗を期して練られた。
This strategy was devised with the aim of ensuring invincibility.
A four-character compound (yojijukugo) combining 必勝 (certain victory) and 不敗 (undefeated). The exact origin is uncertain, but it follows a common pattern of pairing near-synonyms for emphasis.