避其锐气，击其惰归 (避其銳氣，擊其惰歸) bì qí ruìqì, jī qí duò guī

bì qí ruìqì, jī qí duò guī phrase avoid the enemy when he is fresh and strike him when he is tired and withdraws
Domain: Proverb 谚语
Notes: (CC-CEDICT '避其銳氣，擊其惰歸')