thin air (English, noun)
expansion: thin air (uncountable)
Senses:
glosses: An unknown location; (by extension) apparent disappearance or nonexistence.
tags: figuratively
humorous
idiomatic
uncountable
usually
glosses: Used other than figuratively or idiomatically: see thin, air, (especially, low-density air as a result of high altitude).
tags: uncountable
Forms: