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Up in the air
means that something is undecided or uncertain. When things are “up in the air,” it usually means there’s no clear plan or answer yet.
Examples:
1- The actress’s plans to join the movie are up in the air—fans are eagerly waiting to see if she'll sign on.
2- When the concert was postponed due to weather, fans felt frustrated because the reschedule date was still up in the air.