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Idiom of the day: Hard nut to crack.  Meaning: A problem that is hard to solve or a person who is difficult to understand.  Example: Our product sells well in the States, but the European market is a hard nut to crack.

Idiom of the day: Hard nut to crack. Meaning: A problem that is hard to solve or a person who is difficult to understand. Example: Our product sells well in the States, but the European market is a hard nut to crack.

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