thin air

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thin air

/ˌθɪn ˈɛə(ɹ)/

noun

figuratively, humorous, idiomatic, uncountable, usually An unknown location; (by extension) apparent disappearance or nonexistence. Where did you think the exhaust would go? Into thin air?
uncountable Used other than figuratively or idiomatically: see thin, air, (especially, low-density air as a result of high altitude). 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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MLA

"thin air." Wiktionary, via Micwyn, micwyn.com/word/thin%20air. Accessed 6 Nov. 2026.

APA

thin air. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/thin%20air

Chicago

"thin air." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/thin%20air.

BibTeX

@misc{thin_air_2026,
  title = {thin air},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/thin%20air},
  urldate = {2026-11-06}
}