into thin air

listen to the pronunciation of into thin air
الإنجليزية - الإنجليزية
immediately and inexplicably out of sight

He seemed to vanish into thin air.

disappear into thin air
(deyim) Disappear quickly, without leaving a trace

Money seems to disappear into thin air these days. Jack just vanished into thin air before the meeting had started.

vanish into thin air
disappear without a trace, disappear without leaving clues as to where
vanished into thin air
disappeared without a trace, completely gone