敗軍の将は兵を語らず（はいぐんのしょうはへいをかたらず）

Japanese vocabulary

Meaning: don't be a sore loser; don't make excuses for your failures; a defeated general should not talk of strategy

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “敗軍の将は兵を語らず” pronounced in real videos (YouGlish)