tough nut

listen to the pronunciation of tough nut
İngilizce - Türkçe

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tough nut to crack
(deyim) çetin ceviz
a hard/tough nut to crack
k. dili çetin ceviz
İngilizce - İngilizce
tough nut to crack, tough issue
tough nut to crack
A difficult or sticky problem

Defending against malware has become a tough nut to crack as programs become ever more cleverly designed.

tough nut