What does sharp as a tack mean?

Looking for the meaning or definition of the word sharp as a tack? Here's what it means.

Adjective (simile, colloquial) very intelligent Find more words! 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She was sort of a chronic decorator, and sharp as a tack. But Ophelia was smart. Sharp as a tack. Everybody in the firm knew it. When Mum died at ninety she was still as sharp as a tack. Everything else wore out. Cassandra is sharp as a tack, awkward, and still young enough to greet her awakening desire and finer perceptions with astonishment and hyperbole. This guy's as sharp as a tack and I respect his opinions immensely. See Also What is another word for sharp as a tack? Sentences with the word sharp as a tack Nearby Definitions sharp-and-a-half Sharp sharp Sharons Sharon fruits Sharon fruit sharpbill sharpbills sharpchin flyingfish sharp cookie sharp cookies sharp-cornered