in a nutshell
Sam nodded. “In a nutshell, yes.”
She watched Jones. “And who will protect the pillars the next time the komatsus invade?”
Jaye Patrick, Huntress, 2007.
nutshell noun
the hard shell around a nut
in a nutshell SPOKEN
used for saying that you are going to express something in a simple direct way:
To put it in a nutshell, we lost the case. [MEDA]