Значение идиомы sharp as a tack

[sharp as a tack] {adj. phr.} 1. Very neatly and stylishly dressed

That new boy always looks sharp as a tack in class.

2. Veryintelligent; smart; quick-witted.

Tom is sharp as a tack; he got100 on every test.



Seven wonders с переводом.
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Значение идиомы sharp as a tack