ㄖㄨˊㄅㄧˋ使ˇˇrúbìshǐzhǐ

  1. 漢書》:海內使使莫不。」比喻指揮自如得心應手 資深導演拍攝現場調度如臂使指」。

as the arm moves the finger (idiom)​, freely and effortlessly, to have perfect command of