To disappear or depart suddenly and completely.

अचानक और पूरी तरह से गायब हो जाना या प्रस्थान करना

English Usage: All his hopes of winning the competition seemed to fly out of the window.

Hindi Usage: प्रतियोगिता जीतने की उसकी सारी उम्मीदें हवा हो गईं।