Definitions for out of thin air
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Princeton's WordNet
out of thin air, out of nothing, from nowhere(adverb)
without warning
"your cousin arrived out of thin air"
Wiktionary
out of thin air(Adverb)
from non-existent, unknown or hidden resources
Citation
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"out of thin air." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/out of thin air>.