to cover, line, or separate with a material that prevents or reduces the passage, transfer, or leakage of heat, electricity, or sound

to insulate an electric wire with a rubber sheath; to insulate a coat with down.

to place in an isolated situation or condition; segregate.

verb

coat , cocoon , cushion , cut off , inlay , island , isolate , keep apart , line , seclude , separate , sequester , set apart , shield , tape , treat , wrap , close off , segregate , cover , enisle , protect