The story
- Proto-West Germanic · inherited from*hnutskallju
- Old English · inherited fromhnutsċiell
- Middle English · inherited fromnotschelle
- English todaynutshell
From Middle English notschelle, from Old English hnutsċiell, from Proto-West Germanic *hnutskallju, equivalent to nut + shell. Cognate with Saterland Frisian Nuteskele, Nuteskil (“nutshell”), Dutch notenschaal (“nutshell”), German Nussschale (“nutshell”). The verb, as well as the legal book sense, is in reference to the phrase in a nutshell (“summarized”).
Etymology from Wiktionary, CC BY-SA 4.0.