to have perfect command of; as the arm moves the finger (idiom); freely and effortlessly
像胳膊指挥手指那样容易。比喻指挥、调动得心应手。
动宾式;作谓语、定语;含褒义
像胳膊支配手指那样。比喻指挥如意,没有牵制。
《汉书·贾谊传》:“令海内之势如身之使臂,臂之使指,莫不制从。”
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