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(as) sharp as a tack
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(of a person) having or showing a high level of intelligence
What is the origin of the idiom "sharp as a tack" and when to use it?
The phrase "sharp as a tack" is believed to have originated in the United States, likely in the early to mid-20th century. The phrase draws upon the sharpness of a tack, which is a small pointed nail used for securing objects. This idiom is used to emphasize someone's intelligence, mental acuity, and quick thinking. It conveys a sense of admiration for their sharpness of mind and intellectual prowess.
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Even at her age, she's still sharp as a tack.
He's a brilliant student, sharp as a tack in every subject he studies.
She's a formidable debater, always quick with her responses and sharp as a tack in her arguments.
He's as sharp as a tack and always comes up with innovative solutions.
The detective's mind is sharp as a tack.
