English Reference
noun · verb

smut

n. · v.
US /ˈsmət/ UK /smˈʌt/ smut UK spelling smutted, smutting

  1. 01 C1 Advanced Informal

    n.books, films, or pictures that are sexual in a way that people find dirty or offensive.

    n.sexually vulgar or pornographic material, often used with a derogatory or dismissive tone.

    Simple

    The local shop was criticized for selling smut to teenagers.

    In context

    The moral crusaders of the era frequently campaigned against what they termed 'cheap smut' appearing in popular pulp magazines.

  2. 02 C2 Proficiency Literary

    n.a small piece of dirt, soot, or ash that makes a mark on something.

    n.a flake of soot or ash; also the collective black matter produced by incomplete combustion.

    Simple

    A piece of smut from the chimney landed on her white dress.

    In context

    The industrial fog left a fine layer of black smut on every windowsill in the district.

  3. 03 C2 Proficiency Technical Science

    n.a type of fungus that grows on crops like corn and wheat, making them turn black.

    n.any of various parasitic fungi of the order Ustilaginales that cause plant diseases characterized by black, soot-like masses of spores.

    Simple

    The farmer was worried that the corn smut would spread to the rest of the field.

    In context

    Agricultural researchers are developing new hybrids resistant to common cereal smut, which can otherwise devastate annual yields.

  4. 04 C2 Proficiency Literary

    v.to make something dirty with soot or coal.

    v.to stain, smudge, or blacken a surface with soot, coal, or similar grime.

    Simple

    His face was smutted with coal dust after working in the cellar all day.

    In context

    The smoke from the passing locomotive smutted the laundry hanging on the line, much to the residents' annoyance.

    smudgestainblacken

Photograph: Murdo MacLeod/The Guardian It is Smut Slam’s first trip back to Edinburgh in seven years, and it’s not the only sex-laden show in this year’s lineup.

The Guardian· 20 Aug 2026

From Middle English smutten (“to defile, debase”), related to German Schmutz (“filth, dirt, smut”) and schmutzen (“to make dirty, stain”). Doublet of schmutz. Compare also Old English smitta (“smear; blot; mark; stain; pollution”), Old English besmītan (“to besmut; defile; dirty; pollute; contaminate”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Middle English smutten
Level C1 · Advanced
Frequency Occasional
Updated