in a nutshell

In a nutshell is another way of saying you will do something in a few words or concisely. When someone says that something is true in a nutshell, they mean to say that is concisely what has happened or that how they worded something is a good way to put it if they want to use few words. By putting something in a nutshell, it is somewhat of a summary where you are using as few words as possible to describe something.