割雞焉用牛刀 [ㄍㄜ ㄐㄧ ㄧㄢ ㄩㄥˋ ㄋㄧㄡˊ ㄉㄠ; ge1 ji1 yan1 yong4 niu2 dao1] lit. why use a pole-ax to slaughter a chicken? to waste effort on a trifling matter (idiom) ◄ ►