noun: imitation silver. portmanteau of zirconium (an imitation diamond) and silver.
verb: the act of fixing something up so it will pass as authentic, or new, for the purpose of increasing it's apparent value.
noun: dude, i know you aren't about to give your girl that zilver ring you got out of a machine at the grocery store.
verb: man, just zilver it up a little and you'll get a good fifteen bucks for it!