cat's paw常用来比喻a person used as a tool by another;one who is used merely for the convenience of a cleverer or stronger person之意。按其内涵,这个成语与汉语成语“为虎作伥”所比喻的意义相似,仅是动物的形象不同
cat's paw除了单独做复合名词使用外,还构成to make a cat's paw of sb(利用某人做为工具或爪牙)
eg:It is easy for him to be used as a cat's paw of evil-doing.