纵虎归山 (縱虎歸山) zōng hǔ guī shān

zōng hǔ guī shān set phrase let the tiger return to the mountain; to let the enemy go
Domain: Idiom 成语 , Subdomain: , Concept:
Notes: (CC-CEDICT '縱虎歸山'; Guoyu '縱虎歸山')