A/one smart cookie noun phrase
Used to describe a person who is smart, clever or intelligent
John can solve every puzzle in the blink of an eye. He is one smart cookie in my class.
Through the way he talks, I can tell that he is a smart cookie.
To use one's own intelligence
A young person who is very clever and successful.
Wise or intelligent poeple think alike or have the same ideas
1. Lit. Very sharp.
2. Very smart.
To escape from the statement saying that someone is guilty of a crime or of doing something wrong or evade impeachment without being responsible for any sentence or punishment
It is unfair that he walked away scot-free though he committed a very serious crime.