into thin air

Popularized by Shakespeare, see quotations.

• "He seemed to vanish into thin air."
• "Our Reuels now are ended: Theſe our actors, / (As I foretold you) were all Spirits, and / Are melted into Ayre, into thin Ayre, / And like the baſeleſſe fabricke of this viſion"

• out of thin air
• vanish to the four winds