大動干戈　

◎ 大動干戈 dàdòng-gāngē

(1) [stage a war]∶干戈:古代兩種兵器。指進(jìn)行戰(zhàn)爭

(2) [make a big fuss over]∶比喻大張聲勢地行事

這事很簡單,何必大動干戈呢

(3) [take effort to do]∶比喻大費手腳

(4) [attack brutally;strike violently]∶也指大打出手