Thin air

//ˌθɪn ˈɛə(ɹ)// noun

Definitions

Noun
  1. 1
    An unknown location; (by extension) apparent disappearance or nonexistence. figuratively, humorous, idiomatic, uncountable, usually

    "Where did you think the exhaust would go? Into thin air?"

  2. 2
    nowhere to be found in a giant void wordnet
  3. 3
    Used other than figuratively or idiomatically: see thin, air, (especially, low-density air as a result of high altitude). uncountable

    "You'll need to stay mindful of taking breaks, drinking water, and avoiding overexertion up here, because you're dealing with thin air at this altitude."

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