She's a sharp cookie and saw through his lies.
sharp cookie
idiomOne who is intelligent, bright, or sharp; especially, one who can identify attempts to deceive or mislead.
The lawyer was a sharp cookie who quickly noticed the contradiction in the witness's statement.
A sharp cookie who had survived three corporate takeovers, she immediately recognized the veiled threat beneath his polite words.
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Oreo cookie
A black person that appears to the community to embody the social and cultural features of a white person
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sharp elbows
A willingness to sacrifice others to advance one's own ambitions.
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sharp tongue
The practice or characteristic of speaking to others in a harsh, critical, or insulting manner.