partir en fumée
Meanings
Verb
1. to be consumed by and destroyed in fire (which is only implied) such that smoke is the only evidence of something having happened (ash, smut, etc. notwithstanding) (intransitive, simultaneously euphemistic and, usually, hyperbolic)
2. to be ruined, destroyed (intransitive, figuratively)
3. to go up in smoke, vanish into thin air (intransitive, figuratively)