up in the air

US /ʌp ɪn ðə ɛr/
UK /ʌp ɪn ðə ɛr/
"up in the air" picture
1.

悬而未决, 不确定

uncertain or undecided

:
Our travel plans are still up in the air.
我们的旅行计划仍然悬而未决
The future of the project is completely up in the air.
这个项目的未来完全悬而未决