in a nutshell
US /ɪn ə ˈnʌt.ʃɛl/
UK /ɪn ə ˈnʌt.ʃɛl/

1.
in poche parole, in sintesi
in the fewest possible words; briefly
:
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To put it in a nutshell, we're bankrupt.
In poche parole, siamo in bancarotta.
•
Can you explain the whole situation in a nutshell?
Puoi spiegare l'intera situazione in poche parole?