up in the air

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up in the air

Uncertain; subject to change. Becky and I were supposed get brunch this weekend, but things are up in the air now because she's not feeling well. Because the whole town protested plans to build a new shopping center, that proposal is now up in the air.
See also: air, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

up in the air (about someone or something)

Fig. undecided about someone or something; uncertain about someone or something. I don't know what Sally plans to do. Things were sort of up in the air the last time we talked. Let's leave this question up in the air until next week.
See also: air, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

up in the air

Not settled, uncertain, as in The proposal to build a golf course next to the airport is still up in the air. This metaphoric expression likens something floating in the air to an unsettled matter. Put as in the air from the mid-1700s, it acquired up in the first half of the 1900s.
See also: air, up
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

up in the air

COMMON If an important decision or plan is up in the air, it has not been decided or arranged yet. At the moment, the fate of the Hungarian people is still up in the air. This project is very much up in the air.
See also: air, up
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

up in the air

(of a plan or issue) still to be settled; unresolved.
1995 Scientific American Prospects for federal research and development are up in the air as Republicans looking for budget cuts take control on Capitol Hill.
See also: air, up
Farlex Partner Idioms Dictionary © Farlex 2017

up in the air

verb
See also: air, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

up in the air

Not yet decided; uncertain.
See also: air, up
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

up in the air

Unsettled, undetermined. This metaphor for unsettled matters floating about like clouds, or perhaps like birds flying in the air, was occasionally put simply as in the air. Thomas Jefferson used it that way in 1797 (Writings): “I consider the future character of our Republic as in the air.”
See also: air, up
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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