哀兵必勝

哀兵必胜
āibīngbìshèng
an army burning with righteous indignation is bound to win (idiom)

CEDICT

an army burning with indignation is bound to win

Wiktionary

語本《老子．第六九章》：「抗兵相加，哀者勝矣。」指受壓迫的一方，因懷有悲憤的情緒，必能克敵制勝。

重編國語辭典

指受壓迫的一方，因懷有悲憤的情緒，必能克敵制勝

維基詞典

Entry Composition

1 哀 āi
  1. (bound form) sorrow; grief; pity
  2. (bound form) to grieve for; to pity; to lament; to condole
2 兵 bīng
  1. soldiers
  2. a force
  3. an army
  4. weapons
  5. arms
  6. military
  7. warlike

classifier: 個
3 必勝 bìshèng
  1. to be certain of victory
  2. to be bound to prevail