Also means
crack cocaine
Usage Note
Crack in French has two main senses: an informal term for a highly talented person or expert (un crack en maths = a maths whiz), and the drug crack cocaine. The first sense is common in everyday speech and sports journalism. The drug sense is also used but requires context to distinguish.
Examples
"C'est un crack en informatique."
Natural Translation
He is an ace at computing.
Literal Translation
He is a crack at computing.

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