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Tack
[NOUN]5
(nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
Examples
1. He remained sharp as a tack.
2. He's as sharp as a tack.
3. My grandfather is a bit soft in the head, but he's still sharp as a tack when it comes to telling stories.
4. The situation was so serious that after a few polite exchanges they quickly got down to brass tacks.
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