割鸡焉用牛刀gē jī yān yòng niú dāo释义lit. why use a pole-ax to slaughter a chicken? (idiom)fig. to waste effort on a trifling matteralso written 殺雞焉用牛刀|杀鸡焉用牛刀[sha1 ji1 yan1 yong4 niu2 dao1]单字详解割ge鸡ji焉yan用yong牛niu刀dao