
der Crack
expert / ace
(Colloquial) A person who is exceptionally good and talented in a particular field; an expert or professional.
Er ist ein echter Crack, wenn es um Computerprobleme geht.
He's a real expert when it comes to computer problems.
crack / expert
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expert / ace
(Colloquial) A person who is exceptionally good and talented in a particular field; an expert or professional.
Er ist ein echter Crack, wenn es um Computerprobleme geht.
He's a real expert when it comes to computer problems.

crack
A drug made from cocaine that is smoked. It is extremely quickly addictive.
Der Konsum von Crack hat verheerende gesundheitliche Folgen.
The use of crack has devastating health consequences.
The two meanings are easy to distinguish. If someone is talking about a person who is especially good at something, the expert is meant. If it is about drugs, crime, or health problems, the drug is meant.
Mein Bruder ist ein absoluter Crack in Physik.
My brother is an absolute ace in physics.
When 'Crack' (expert/ace) refers to an expert, the field is often given with the preposition 'in' and the dative. The pattern is: 'jemand ist ein Crack in etwas' (someone is an expert/ace in something).
Sie ist ein Crack in der Programmierung von Apps.
She is an expert in programming apps.
Calling a person a 'Crack' (expert/ace) is colloquial. In formal or written contexts, you would more likely use words like 'Experte' (expert) or 'Spezialist' (specialist).
Wenn du Hilfe bei der Reparatur brauchst, frag meinen Nachbarn, der ist ein echter Crack.
If you need help with the repair, ask my neighbor; he's a real expert.
In connection with the drug, 'Crack' (crack) is often used with verbs such as 'konsumieren' (to use/consume), 'rauchen' (to smoke), or 'nehmen' (to take). Nouns such as 'Sucht' (addiction) or 'Abhängigkeit' (dependency/addiction) are also typical.
Der Film thematisiert die Gefahren der Crack-Abhängigkeit.
The film addresses the dangers of crack addiction.
expert
Experte and Crack can both refer to a particularly competent person. Experte is neutral and emphasizes expertise or recognized proficiency. Crack is colloquial and highlights exceptional skill or talent, so it is mainly used in casual conversations.

Im Team gilt Leo wegen seines außergewöhnlichen Könnens als echter Crack.
Leo is considered a real ace on the team because of his exceptional skills.
Für das schwierige Softwareproblem beauftragt die Firma einen Experten.
The company hires an expert to deal with the difficult software problem.