smutyoudaoicibaDictYouDict[smut 词源字典]
smut: [16] Smut is a member of a large but loosely-knit family of West Germanic words beginning with sm and ending in t or d that convey the general notion of ‘putting dirt on something’. Others include German schmutzen ‘get dirty’ and English smudge [15], and also English smite, which originally meant ‘smear’. Smut itself may have been borrowed from Low German smutt.
=> smite, smudge[smut etymology, smut origin, 英语词源]
smut (n.)youdaoicibaDictYouDict
1660s, "black mark, stain," from verb smutten "debase, defile" (late 14c.), later "stain or mark with soot, etc." (1580s), cognate with Middle High German smotzen "make dirty," from West Germanic *smutt- (cognates: Middle High German smuz "grease, dirt;" German Schmutz "dirt," schmutzen "to make dirty"). The meaning "indecent or obscene language" is first attested 1660s.