Balloon Goes Up Meaning
(idiomatic) Something exciting or dangerous begins.
Example: - When is your job interview?
- The balloon goes up at 10 tomorrow.
P. G. Wodehouse
â€œThen may I tell Harold that the balloon's going up?â€ said Stiffy. â€œI beg your pardon?â€ â€œI mean it's official about this vicarage?â€