1
general::
Also, leave hanging in the air or in midair. Keep undecided, uncertain, or in suspense. For example, Since we hadn't found a big enough hall, we left the final date hanging, or She couldn't figure out a good ending for the book, so her audience was left hanging in midair.
American Heritage Idioms
2
general::
Phrase(s): leave someone or something hanging (in midair) [and] keep someone or something hanging (in midair)
1. Lit. to keep someone or something suspended in midair when support for the person or thing is removed. • The ladder collapsed and left me hanging in midair. Fortunately, I grabbed onto the windowsill. 2. Fig. to suspend dealing with someone or something; to leave someone or something waiting to be finished or continued. • She left her sentence hanging in midair. • Tell me the rest of the story. Don’t leave me hanging in midair.
McGrawhill's American Idioms And Phrasal Verbs