敌人开户 (敵人開戶) dírén kāi hù

dírén kāi hù phrase when the enemy leaves an opening
Domain: Literary Chinese 文言文
Notes: Quote: from the Warring States period text 孫子兵法 “Art of War” by Sunzi, section 11 (Amies 2021 tr.; see also tr. by Giles 1910, p. 148)