Made a mistake or did something wrong.
From Old French 'errer', from Latin 'errare' meaning to wander or go astray. The word originally meant literal wandering and evolved to mean going astray morally or intellectually by the 12th century.
Latin 'errare' meant 'to wander'—notice how getting lost physically and getting lost morally used the same word? This suggests ancient peoples saw mistakes as a form of deviation from the right path, a metaphor we still use with phrases like 'led astray' or 'lost their way.'
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