thin air - Wiktionary, the free dictionary

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English

Pronunciation

IPA^(key): /ˌθɪn ˈɛə(ɹ)/
Audio (General Australian): (file)

Noun

thin air (uncountable)

(idiomatic, figuratively, usually humorous) An unknown location.

Related terms

into thin air, out of thin air

See also

out of the blue