Wrapped up snugly and securely, as if enclosed in a cocoon; protected or isolated from the outside world.
From 'cocoon' (from French cocon, from Malay kukon, meaning a fibrous covering spun by caterpillars). The past participle '-ed' makes it an adjective describing something wrapped in protective layers.
Caterpillars spin cocoons made of silk thread—sometimes thousands of meters long—creating the perfect isolation chamber for their transformation into butterflies. When we use this word, we're borrowing that image of perfect protection.
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