be whistling in the wind
To be talking about something that is unlikely to happen. Oh, he's just whistling in the wind—he'll never run for office.
be whistling in the wind
If someone is whistling in the wind, what they are saying is not realistic or will never happen. Until there is a dramatic improvement in employment prospects, these so-called experts on getting a job are just whistling in the wind. The government is whistling in the wind if it believes that it will achieve a lasting settlement.