wave goodbye

verb2

1. •
   To say goodbye by means of a handwave.
2. •
   (figurative) Synonym of say goodbye (“cease to have, or have to do, something”).

   • "At the moment, you know the maximum you pay [to go between London and Scotland] is £87 on a Sunday afternoon. And it's refundable. Now, if your plans change, you can wave goodbye to your money." — 2024