into thin air
US /ˈɪntu θɪn ɛr/
UK /ˈɪntu θɪn ɛr/

1.
憑空, 無影無蹤
disappearing completely and mysteriously
:
•
The magician made the rabbit vanish into thin air.
魔術師讓兔子憑空消失了。
•
All our plans for the trip vanished into thin air when the airline cancelled our flight.
當航空公司取消我們的航班時,我們所有的旅行計劃都憑空消失了。