ㄕㄤˋㄒㄧㄚˋㄑㄧˊㄕㄡˇshàngxià‑qíshǒu

  1. 比喻善於玩弄手段暗中作弊 這個有利可圖總是上下其手從中牟取利益可惡」。

to raise and lower one's hand (idiom)​; to signal as conspiratorial hint, fig. conspiring to defraud