Opposed to or designed to prevent smut, which can refer to obscene material or a fungal disease affecting grain.
From 'anti-' (against) and 'smut,' an Old English word of uncertain origin that originally meant soot or dirt, later applied to both fungal plant disease and obscene content.
The word 'smut' brilliantly shows how one word can have wildly different meanings—farmers use it to mean a devastating grain fungus, while censors use it to mean pornography, yet the word comes from the dark, sooty appearance they both share!
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