thin air

== English == === Pronunciation === IPA(key): /ˌθɪn ˈɛə(ɹ)/ === Noun === thin air (uncountable) (idiomatic, figuratively, usually humorous) An unknown location; (by extension) apparent disappearance or nonexistence. Used other than figuratively or idiomatically: see thin,‎ air,‎ (especially, low-density air as a result of high altitude). ==== Related terms ==== into thin air, out of thin air ==== See also ====