That's a term meaning 'the short version' of a particular explanation or story, many times leaving out mitigating details.
It means "in a few words"
When someone says in a nutshell, it generally means a summary of something, or a short version of a story. For example:
"What is the problem?"
"In a nutshell, I had a bad day."
Amanda Roraback has written: 'China in a Nutshell' 'Korea In A Nutshell (Nutshell Notes)' 'Islam in a nutshell' -- subject(s): Essence, genius, nature, Islam 'Iran in a Nutshell' 'Pakistan in a nutshell' -- subject(s): History 'Afghanistan in a Nutshell' 'Islam in a Nutshell (Nutshell Notes)'
That's my example, in a nutshell.
The Universe in a Nutshell was created in 2001.
In a Nutshell was created on 2007-03-28.
Best of Nutshell was created in 1981.
Nutshell - song - was created in 1993.
He went into his nutshell because of the bullying. Here nutshell means he was afraid and went into his zone.
The Universe in a Nutshell has 224 pages.
Flyaway - Nutshell song - was created in 1977.
Well, to put it in a nutshell, we're going to have to start again.
All in a Nutshell - 1949 is rated/received certificates of: Argentina:Atp
The cast of Nutshell - 2010 includes: Christopher Augustus Aubrey Capulong