1A shoe heel made of rubber.
2Slang. A person who investigates the conduct of members of his or her own organization; specifically an internal police investigator.
Mid 19th century. From rubber + heel.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。