ear-muff (n.)youdaoicibaDictYouDict[ear-muff 词源字典]
also earplug, 1859, from ear (n.1) + muff (n.).[ear-muff etymology, ear-muff origin, 英语词源]
ear-plug (n.)youdaoicibaDictYouDict
also earplug, 1841, from ear (n.1) + plug (n.).