如臂使指 [－－－－]

Jyutping jyu4 bei3 si2 zi2
Pinyin rú bì shǐ zhǐ

Definitions (CC-CEDICT)
  1. as the arm moves the finger (idiom)
  2. freely and effortlessly
  3. to have perfect command of
Definitions (Wiktionary)
  1. verb
    to control or handle someone/something effectively and easily