百 bai3 百
战 zhan4 戰
不 bu4 不
殆 dai4 殆
  1. to come unscathed through a hundred battles (idiom, from Sunzi's "The Art of War" 孫子兵法|孙子兵法[Sun1 zi3 Bing1 fa3]); to win every fight

Examples

知彼知己，百战不殆。

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