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: Foam at the mouth. Meaning: To be extremely angry. Example: She was almost foaming at the mouth when she heard about the cost of the car repairs. Origin: Like many other idioms, it may have first been used by William Shakespeare.