noun

1. 1. sooty matter
   2. a particle of this
2. a mark made by something dirty; soiled spot
3. pornographic or indecent talk, writing, etc.
4. Bot.
   1. any of various plant diseases, esp. of cereal grasses, characterized by the appearance of masses of black spores which usually break up into a fine powder
   2. any of an order (Ustilaginales) of basidiomycetous fungi causing smut

Etymology: < or akin to LowG smutt, akin to Ger schmutz, dirt < IE *(s)meud- < base *meu-, wet, musty > mud, moss

transitive verb smutted smut′·ted, smutting smut′·ting

Etymology: later var. of ME smoten, besmirch

intransitive verb