Bad or wrong actions, especially those that break rules or laws.
From Old English 'misdōn' combining 'mis-' (badly) and 'dōn' (to do). The modern sense developed in Middle English to describe morally or legally wrong acts.
This word's structure reveals how English loves adding 'mis-' to show the opposite—misspell, misunderstand, misbehave—making it super easy to invent new words that everyone instantly understands.
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