cat是猫，paw是爪子，但cat's paw可不仅仅指猫的爪子，真实含义是傀儡；受人利用者；替人做坏事的人、被人利用的工具。

【例句】
You have been used as a cat's paw by that woman; she only wanted you to help her get into local society.
你被那女人利用了，她只是要你帮助她进入当地的社交界而已。

He thought he was helping his friend, but little did he know he was just a cat's paw in their scheme.
他以为他在帮助他的朋友，但他并不知道他只是他们计划中的替罪羊。