leave someone up in the air
Fig. to leave someone waiting for a decision. Please don't leave me up in the air. I want to know what's going to happen to me. Nothing was decided, and they left me up in the air.
leave something up in the air
Fig. to leave a matter undecided. (Alludes to something drifting in the air, moving neither up nor down.) Let's get this settled now. I don't want to leave anything up in the air over the weekend. The whole matter was left up in the air for another week.