A difficult or sticky problem.
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Defending against malware has become a tough nut to crack as programs become ever more cleverly designed.

Submitted on September 01, 2009

Additional definitions for 'tough nut to crack':

Tough Nut to CrackSomething that’s not much easier to understand or difficult to do; harder to solve a problem
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مهره سخت برای شکستن

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