The superlative form of smart, meaning the most intelligent or clever; also can mean the most fashionable or stylish.
From Old English 'smeart' meaning sharp pain or sting, from Proto-Germanic roots. The meaning shifted to 'lively, brisk' and then to 'clever' by the 17th century, with the style meaning developing later.
The word 'smart' literally came from the feeling of a sting or sharp pain—which is wild because we now use it for intelligence, showing how our language evolved from physical sensations to describe mental sharpness!
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