leave hanging
leave hanging or leave hanging in the air {v. phr.}
To leave undecided or unsettled.
Because the committee could not decide on a time and place, the matter of the spring dance was left hanging.
Ted's mother didn't know what to do about the broken window, so his punishment was left hanging in the air until his father came home.
Compare: UP IN THE AIR.
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Source: A Dictionary of American Idioms