知己知彼 zhījǐzhībǐ to know oneself and know the enemy Origin Definitions Defs Strokes Stroke Words Sentences Sents 知己知彼，百战不殆 zhījǐzhībǐbǎizhànbùdài know yourself and know your enemy Know yourself and know your enemy, and you will never be defeated; a classic military strategy from the ancient text [[孙子兵法|孫子兵法|sun1 zi3 bing1 fa3]]