You know what it looks like… but what is it called?
TAKE THE QUIZ“thin-air”
The following 3 entries include the term thin-air.
disappear/vanish into thin air
idiom: to disappear completely in a way that is mysterious
into thin air
idiom: in a very sudden and mysterious way
out of thin air
idiom—used to say that someone or something appears in a sudden and unexpected way
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Merriam-Webster unabridged