Crossword Clue:

Thin out and disappear

AnswerCrossword Clue
INTODisappear -- thin air
INTODisappear ... thin air
INTODisappear...thin air
EVAPORATEDisappear into thin air
EVAPORATEDisappear into thin air.
VANISHDisappear into thin air.
VANISHDisappear into thin air