避其锐气，击其惰归避其銳氣，擊其惰歸

bì qí ruì qì , jī qí duò guī

Meaning

avoid the enemy when he is fresh and strike him when he is tired and withdraws (idiom)

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Characters

避bìto avoid, to turn away; to escape, to hide辶辟其qíhis, her, its, their; that甘一八锐ruìsharp, pointed; keen, acute钅兑气qìair, gas; steam, vapor; anger亻击jīto strike, to hit, to beat; to attack, to fight凵惰duòlazy, idle, indolent; careless忄左⺼归guīto return, to go back; to return to, to revert彐