In effect, companies from Apple on down are using cash as a form of insulation.
Fallen trees are filled with insulation, film tape, and in one occasion a bed.
The demise of Gaddafi adds a much-needed layer of insulation against GOP attacks as the 2012 campaign heats up.
1848, "act of making (something) into an island," noun of action from insulate. Transferred sense attested by 1798. Electrical sense is from 1767. The concrete sense of "insulating material" is recorded by 1870.