Definitions from Wiktionary (sharp as a tack)
▸ adjective: (simile, colloquial) Very intelligent.
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▸ adjective: (simile, colloquial) Very intelligent.
Similar:
sharp,
razor-sharp,
sharp-witted,
smart,
sharpwitted,
sharp as a butter knife,
sharp as a bowling ball,
needle-sharp,
tart,
pointed,
more...
Opposite:
▸ Words similar to sharp as a tack
▸ Usage examples for sharp as a tack
▸ Idioms related to sharp as a tack
▸ Wikipedia articles (New!)
▸ Popular nouns described by sharp as a tack
▸ Words that often appear near sharp as a tack
▸ Rhymes of sharp as a tack
▸ Invented words related to sharp as a tack