Directions: Read the following sentence and choose the correct answer
The phrase, “A hard nut to crack” means ___________.

The correct answer is: A very difficult problem

Nuts are always difficult to crack open. And a hard nut is much difficult to crack. This idiom says that problems are always difficult to deal with. But it is very difficult to deal with a very big problem. If one troubles to deal with a problem, then he says that it was a hard nut since he cannot crack it. Sometimes, some people will react for nothing and they are unable to get influenced. Such people are called as hard nut where they don't crack at any point.