mien (n.)youdaoicibaDictYouDict[mien 词源字典]
"facial expression," 1510s, probably a shortening of Middle English demean "bearing, demeanor" (see demeanor) and influenced by Middle French mine "appearance, facial expression," which is of unknown origin, possibly Celtic (compare Breton min "beak, muzzle, nose," Irish men "mouth").[mien etymology, mien origin, 英语词源]