whistle down the wind

verb3

1. •
   To set (someone) free, allowing them to go their own way and do what they choose.

   • Can he do nothing for his Burns but make a Gauger of him; lionise him, bedinner him, for a foolish while: then whistle him down the wind, to desperation and bitter death? — 1843
2. •
   To badmouth someone or something; to disparage.

   • It is very easy for you to whistle down the wind an eligible partner. There are far too many of us who can only wish we might have had the choice! — 2013
3. •
   To talk to no purpose.