a crack shot; crack cocaine
Does the adjective "crack" mean "deadly" in both noun phrases above?
No. The "crack" in "crack shot" is an old word, the same one as in "all it's cracked up to be". It means "excellent".
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No. The "crack" in "crack shot" is an old word, the same one as in "all it's cracked up to be". It means "excellent". The one in "crack cocaine" is street talk for the type that comes in little rocks instead of the former usual powder. *** only knows how it came to be called that, but I doubt it is the same rather obscure word as the first.
They apparently are similar in sense. A crack shot is an elite shot, like crack troops are elite troops. And crack (cocaine) is "elite" (in an ironic sense) cocaine.