【放冷箭 fàng lěng jiàn】

　　Stab in the back.Used as a metaphor to refer to playing tricks behind sb.'s back, or secretly getting sb. into trouble.

　　【Example1】他就会背后放冷箭，真让人火大。

　　He often stabs people in the back, which enrages me.

　　【Example2】卑怯而狡猾的懦夫则往往想要暗中施放的冷箭。

　　Base and crafty cowards, are like the arrow that shoots in the dark.