be up in the air
if something is up in the air, no decision has been made about it yet

[TahlilGaran] Dictionary of Contemporary English ▲

up in the air
not decided or completely developed.
We have no idea which school she'll be attending in September — everything is still up in the air.

Will a strike take place? That's up in the air.

Related vocabulary: leave something hanging

[TahlilGaran] English Idioms Dictionary ▲

up in the air
not settled, undecided
Whether or not I will be able to go to London is still up in the air.

[TahlilGaran] English Idioms Dictionary ▲

up in the air
adj. or adv. phr.
1. informal In great anger or excitement.
My father went straight up in the air when he heard I damaged the car.
The Jones family are all up in the air because they are taking a trip around the world.
Compare: HIT THE CEILING, BLOW A FUSE.
2. also in midair Not settled; uncertain; undecided.
Plans for the next meeting have been left up in the air until Jane gets better.
The result of the game was left hanging in midair because it rained before the finish.
Compare: LEAVE HANGING.

[TahlilGaran] English Idioms Dictionary ▲