語源はコンク、クラムと同じ。-繭、大言壮語の接尾辞。つまり、硬い殻に守られていることのたとえ。
A lady with an enchanting name, Faith Popcorn, has identified a menacing new American behavior that she gives the sweet name of 'cocooning.' It threatens the nation's pursuit of happiness, sometimes called the economy. [George Will, April 1987]Related: Cocooned; cocooning.