兵不厭詐 [－－厌诈]

Jyutping bing1 bat1 jim3 zaa3
Pinyin bīng bù yàn zhà

Definitions (CC-CEDICT)
  1. there can never be too much deception in war
  2. in war nothing is too deceitful
  3. all's fair in war
Definitions (粵典–words.hk)
  1. 語句
    用兵​時​唔​排斥​以​欺​詐​嘅​方法​去取​勝​。​後​引申​到​各種​方面​，​例如​職場​、​情場​等
    to defeat the opponent in a cunning way
Definitions (Wiktionary)
  1. phrase, idiomatic
    all's fair in love and war
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）