Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: Perhaps from smot 'dirty mark' (16-19 centuries)

smut

noun
     
smut
1 [uncountable] books, stories, talk etc that offend some people because they are about sex:
I won't have smut like that in my house!
2 [uncountable and countable] dirt or soot (=black powder produced by burning), or a piece of dirt or soot

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