We use the idiom "a tough nut to crack" to talk about problems that are difficult to solve, or to talk about people who won't do what you want them to.
However, this video is about a nut that is really tough to crack.
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Tough Interview Questions
Job review company Glassdoor have compiled a list of the toughest interview questions by country. Here are the toughest from the UK for 20...
A tough nut to crack
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