Having considerable knowledge, experience, or skill in a particular subject or activity.
From Latin 'versatus,' past participle of 'versari' (to occupy oneself with, to be engaged in), from 'vertere' (to turn). The word originally meant 'turned' or 'occupied with,' suggesting someone who has turned their attention repeatedly toward a subject.
You're 'versed' in something when you've turned toward it so many times that it becomes familiar—the Latin root 'vertere' (to turn) is the same root that gives us 'advertisement,' the act of turning people's attention toward something.
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